Yes, they do, but the premise in my comment (and this discussion) is that a TUI is being written today.

TUIs built today should be usable by AI agents. I'm not sure exactly what it looks like but I'm imagining that every UI view has an associated CLI command that can yield precisely that view. Maybe like formally structured breadcrumbs, or maybe like Emacs "keyboard macros".

Ah right, sorry, you were making a much more interesting point than my reply! I read "UI development" and jumped to the conclusion that the point was just about inference-time modify-test cycles. Yes, agreed, if they trained on images, or even better (?) on (code, image) or (code-delta, image-delta) pairs, they would surely be better at UI development.

Getting them to take screenshots with playwright/puppeteer and look at them as part of their development iteration cycle works well.