"The website is good, it probably could be even better, no doubts. But it's "good enough". It does the job. It's stable. It's mobile optimised. It's got a good conversion rate relative to others and our expectations. What else can we do? Is it the right thing to do to have a team purely focused on conversion rate optimisation, or should we look more into product and trading? What even is the potential of our site?"
That was a thought-provoking quote direct from a prospect of ours in a recent sales call.
He's talking honestly about the idea of prioritisation and diminishing returns. A very well-known brand, decent infrastructure, good content, a site that works very well; probably even over-indexes on conversion rate efficiency if you're to compare it to competitors. He'd looked at the size of the remaining prize from making the digital experience better and quietly concluded it might be smaller than the prize from doing something else entirely.
This is a question of "where do you place your bets?"
I think they have reached a local maximum. For anyone who hasn't sat through the optimisation lecture: it's the top of a hill that isn't the top of the mountain. Every small step available from where you're standing leads downwards, so you stop climbing. Not necessarily because you've reached the highest point there is, but because you've reached the highest point reachable in small steps. Which is a fairly precise description of what a decade of testing does to an already-decent website. In other words, getting to a higher peak means changing direction.
He's asking the right question in my opinion and I think the honest answer is uncomfortable for most of the industry I've spent my entire career in, especially the purists.
This brand hasn't necessarily hit the limit of what's possible on their website. But instead has hit the ceiling of the average and anything further sees diminishing returns where the effort doesn't necessarily equate to the value. That, or he's potentially bored with the same-same solutions that are out there. Homogeneity is the killer of excitement.

I empathise. I got bored too.
I founded User Conversion; one of UK's most successful (read: largest?) independent conversion rate optimisation agencies. We did well, working with some of the biggest brand names the UK had to offer.
But like the above brand, over time, I grew more and more skeptical. A lot of our recommendations lacked creativity, they were all addressing similar problems with the same solutions. "Moving deck chairs on the Titanic" is what someone once put to me.
Conversion rate optimisation is a process of problem-solving with evidence based solutions. Learning, uncovering opportunities and problems, and fixing those problems; usually through AB testing (well, that's the outcome that most cared about; because it's sexy). And I'm not suggesting that the learning and the opportunities dissipate, but the solution often lacks impact because of the law of diminishing returns, their heterogeneity and the aggregated nature of them.
The evolution resolution beyond CRO
Conversion Rate Optimisation, for stakeholders at least, is a way to make the website earn more; and there are four ways to do that. Most of us have treated them as a maturity ladder. You graduate from one to the next, and the last one is the good one.
That's not quite right. It's less an evolution and I now see them more as levels of resolution where each one narrows the unit of decision.
Level one: conversion rate optimisation. The unit of decision is the average visitor. You look at where people struggle, you fix it, and the fix applies to everybody. This is genuinely valuable and I'd never argue otherwise but it is a) practically often an exercise in usability improvements and b) definitionally serving the mean.
The first statement encompasses this idea that the majority of solutions are things that don't change behaviour, they facilitate existing behaviour. Usability improvements. Small changes that ill-advised vendors purporting marketing promoting statistics have convinced us are worth the effort. We've all seen them. The famed 500% uplifts. Sticky add to cart buttons, adding trust signals under a call to action, that sort of thing. Read: deck chairs on the Titanic.
The second reinforces the statement that the mean doesn't exist. Instead, it is a continuously moving combination of different intent levels. Our own research found that, say, 10% of visitors sitting on checkout pages aren't ready to buy yet. Or that 34% of users never get past browsing, whatever page they happen to land on. There is no average shopper to optimise for, there are different jobs to be done. There's a distribution we've been flattening for twenty years because flattening it was the only thing we could do. And now we're used to that, we lack creativity of how to proceed.
Level two: experimentation. It's the same unit of decision, the average, but now you've proven it. This matters enormously and it's the most rigorous thing most organisations do.
From experience, it often comes in two flavours:
1. The immature version lives inside the CRO team or the marketing function, running client-side tests and it caps out at about four to six experiments a month. That ceiling is a resource limit, often not a statistical significant limit; people, build time, roadmap slots. You'll find here that you'll max out at a certain number of tests usually and your impact is limited to avoid cross-contamination of tests. Ever found yourself saying "we can't run a test on a PDP because we have something running there already?"
2. The more mature version is server-side experimentation, owned by engineering, decentralised across product teams, with testing built into the release process rather than bolted onto it. That version is genuinely near-limitless in cadence, and if you can get there you should; it's fantastic.
But note what even the mature version is for. It's designed to prove or disprove a claim about the population. One answer, for everybody, with confidence attached. That's the instrument working exactly as intended; but it's still an answer about the average. It's also an answer about the website, not the visitor (more on that later).
My prospect's line was exactly this: "For the years we have experimented, we did not see huge benefits. That's probably also what hindered further investment." I've heard that sentence in some form from almost every brand I've worked with.
Level three: personalisation. Here the unit of decision finally narrows to the segment. And here is where the industry has spent a decade making promises it couldn't keep. Unfortunately, to the extent where we now all hold PTSD; personalisation traumatic stress disorder.
Personalisation didn't fail (that's right, I said it failed) because it was a bad idea, every boardroom still talks about it to this day. Trust me, I literally wrote the book on it: The Person in Personalisation.

It failed because it doesn't scale, for two reasons, both of which compound.
1. First, you have to guess the segments before you have any evidence about which distinctions matter. Those pre-defined segments like "returning visitor," "paid traffic," "landed on a PDP" are website attributes, not people attributes. That's not person-alisation that's website-alisation, isn't it? Pageview count stands in for engagement, when a confused shopper racks up far more pageviews than a decisive one i.e. it's not true person-alisation.
2. Second, the arithmetic defeats you. Split traffic three ways and every test takes three times as long to reach significance. Try to prove the segments genuinely differ and you're chasing an interaction effect that needs roughly four times the sample again. A three-week test becomes a quarter-long project, and most teams call it early and ship an artefact, or just don't have the traffic (and therefore patience) i.e. it's not scalable.
So personalisation became a small number of hand-built manual rules, maintained by someone who'd rather be doing something else, delivering less than it promised. Ever wondered why recommendations was the only successful personalisation that brands have achieved? Because it's autonomous; in other words, scalable.
Level four: agentic delivery, with intent as the context. This is where we, Made with Intent, sit. The unit of decision becomes the person and what they're trying to do in the moment. Not the segment on retrospective data. Also, not the average. And critically, nobody writes the rule.
You give the system a strategy and a set of experiences that are already evidenced. It works out which of them suits which state of intent, person by person, at the time that it matters, and it keeps working it out. Nobody writes the rule.
Take one of our customers, Diamonds Factory who had a single basket-abandonment tactic: 25% off, to everybody. They gave the agent four options instead and let it choose between them. Most people, it turned out, didn't need the full discount to convert. And 15% needed no intervention at all.
That last number is the one that matters, because no level below four can produce it. A test has no vocabulary for show this to nobody as a good outcome. Not even the control of an experiment can show you that because a user is never bucketed into both the control and the treatment. A rule-based segment can't discover it. It only appears when something is allowed to decide, per person, whether to act at all, in the moment that it matters.
The Future of Personalisation
I think we treated this as four evolutionary components within a single ladder when, in fact, they're two.
• Levels one and two are about how sure you are. "Does this work." Think of this as 80% exploration, and 20% exploitation.
• Levels three and four are about how precisely you aim. "For whom does it work best, when should it be shown, and do a proportion of users even need it at all?" Think of this as 20% exploration, and 80% exploitation.
Conflating them is why so many personalisation programmes were run by people optimising for certainty, and why so many experimentation programmes never escaped one answer for everybody. Confidence and aim are different problems. You need both, and the tools for each are not the same tool.
The industry has worked out that continuous contextual allocation beats a fixed split. That's 50% of personalisation; serving "the right person, at the right time, with the right message".

The other 50% are the attributes that determine whether something is personal; and for us that's their intent. Their context. Their job to be done. The differentiator is what you put in the context window. Not a website attribute like device or location, because they describe who someone appears to be. Intent describes what they're about to do. One of those is a proxy and one of them is the thing itself.
What I'd actually tell my prospect
Not "invest more in CRO." And not "stop doing CRO," either, because each of these levels still holds a purpose and pretending otherwise is how vendors lose credibility. No, CRO is not dead.
But its purpose has changed. There's more.

Sure, if something is broken, fix it. If a step in the core journey confuses everyone like a login, a checkout, a filter that doesn't work, then everyone passes through it, the fix helps or hurts them all in the same direction, and the right answer is one answer. Optimising the average isn't a failure of ambition there. An experimentation partner of ours put it well: you don't stop the research, you don't stop the UX work, and if you don't have people designing properly for their users you're finished as a business regardless of what any agent does on top.
But once the site is good enough; once you've fixed what's broken and the remaining UX gains are genuinely marginal, I think the question changes. It stops being how do we make this better for everyone and becomes which of the things we already have should this particular person see, and when, and should they see anything at all.
Essentially the argument of diminishing returns. Unless your site is broken, terrible UX, or hard to navigate; the best bet is dynamic, trading-related experiences which capitalise on serving the right content at the right time. Sure I'm biased, but this is my arc within this industry over the past 15 years. I've seen what's possible and I'd like to share it with the world. A TLDR;
There are different ways to optimise, but just note that I've seen first hand that scalability is the biggest constraint to success. Not just that, but doing the same as everyone else, particularly "moving deck chairs on the Titanic" won't get you very far unless the baseline is so low.
The opportunity is vast. It amplifies existing experiences by autonomously serving those only to where the experience is best seen and best felt, excluding where it's not. Because no one in the organisation owns it, or because we are so accustomed to the way things work currently; the opportunity is still sitting there.
My prospect's instinct was right. He should probably move effort away from optimising the average. Just not away from the website.
If you're interested in how CRO is evolving, and want to learn more about intent-based personalisation, get in contact with our team here.
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