UI design (not implementation) is an area where “describe it with a programming language” has historically not worked. So much of what makes a UI good or bad is determined reactively after seeing the initial prototype. Those refinements are rarely based on an encoded set of principles that found their way into a training set, and the code used to implement such refinements was varied enough that models and humans both struggle to infer its intentions after the fact.

This started as soon as they devised the MCP. “we have this new thing called ai you can talk to it naturally. Here’s a protocol to make it work better”