The Person Closest to the Problem Is the Last to See It

For years I ran a team of student workers, and they were good. Better than the job strictly needed them to be. The program that trained them was something I'd built and refined over a long time, and for a long time it worked.

Then, slowly, the new ones stopped being as good. Performance slipped. My first instinct was to look outward for the cause – a weaker hiring pool, a motivation problem, something about the work itself. I spent a while there before I got to the real answer, which was me. I'd done the job and taught it for so long that I'd stopped being able to see the steps I was quietly skipping when I explained it. The parts that had become automatic for me had become invisible to me, and so I'd stopped teaching them at all. My students weren't getting worse. My training was, and I was the last person able to notice.

What fixed it wasn't me trying harder. I handed the training over to three of them and let them rebuild it. They produced a better program than I ever had, because they could still see the parts I'd gone blind to.

This is how expertise works, not a personal failing

I'd like to tell you that was a one-off lapse. It wasn't. It's a well-documented feature of knowing a lot about something.

The research calls it cognitive entrenchment. As people develop deep expertise, they become less able to take the perspective of someone who doesn't share it, and less likely to seek or accept outside input – and, tellingly, when they get disconfirming feedback, they tend to double down with more confident, more precise judgments to defend the identity of being an expert. The expertise that makes you good at the work is the same thing that blinds you to the gaps in it.

It's sharpest precisely inside your own specialty. Studies of the "curse of expertise" find that people are reasonably well-calibrated about what they don't know in unfamiliar areas, but suffer the strongest illusion of understanding in the domain they've studied most deeply – they mistake the knowledge they had at their peak for the knowledge they have now. And it isn't limited to any one field. The "curse of knowledge" – your own knowledge contaminating your read of what others see and need – shows up across medicine, law, education, and business. The more you know, the harder it is to model the view of someone who knows less, including your own earlier self.

Why this matters most for the people who are good at their work

If you run a boutique advisory practice or consult independently, you are the expert. That's the whole basis of the business. And it means the blind spot lands on exactly the person least able to catch it themselves – not because you're careless, but because you're good.

The usual reaction to a capacity ceiling is to reach for more hands: a VA, an assistant, someone to take the overflow. That solves a bandwidth problem. It does nothing for this one, because a junior taking your filing is still working from your frame. What actually helps is a set of eyes that isn't entrenched where yours are – a second pass that cross-references what you're about to stand behind and flags the thing you've gone blind to, before it reaches the client.

Done right, none of that changes whose work it is. The judgment stays yours, the client relationship stays yours, and you present the result as your own, because it is. What the outside pass adds isn't authority. It's the one thing expertise structurally takes away: the ability to see your own work the way someone encountering it fresh would. You were never going to catch that from the inside. Nobody is. That's not a knock on the expert – it's the reason the expert, of all people, is the one who needs the outside read.