The gap between an AI-produced prototype and a shippable product has a shape. Most of us assume it’s the visual 20%: the polish AI output drifts on. Chad Johnson’s case is that the 20% is the trivial part, and the real gap sits upstream of everything visible.

Chad Johnson, writing in his newsletter:

The deeper issue was that nobody had asked whether a prototype was even the right artifact to produce at that stage. The PM had made three assumptions about user intent that we hadn’t validated. They’d skipped past a critical question about whether this flow needed to exist at all, or whether the real problem was upstream in the information architecture. They’d built a beautiful answer to a question nobody had confirmed was worth asking. That’s the part that stuck with me. Not the visual gaps. The thinking gaps.

That lines up with what I’ve been calling C+ out of the box: artifacts that read well and seem credible until you apply critical thinking. Johnson gets specific about what’s actually missing, and none of it is visual: the assumption nobody validated, the upstream question nobody asked. The interface was fine. The thinking was absent from the (probably) AI-generated PRD.

Johnson again:

…design production got democratized, but design judgment didn’t. Anyone can make something now. Almost nobody new learned how to think well about what should be made, why, and for whom. And that gap, between what’s possible to produce and what’s actually been thought through, is now the entire playing field for our profession. Designers aren’t becoming obsolete. They’re becoming stewards.

Judgment still takes years to build, and no tool compresses that.

The last 20% is rarely the gap that matters. The first question—should we build this?—almost always is. Very few teams have the muscle to ask it.