You're arguing for familiarity in tactful design, while I agree that for most users this is a good thing, repeatability of existing patterns does create that immediate familiarity.

HOWEVER, that familiarity is only a virtue because someone, once, deviated hard enough that their deviation became the new familiar. AI can only optimise toward the current snapshot of "familiar". It cannot produce the next one. If designers outsource all their thinking to a model even in tactful design we would never have groundbreaking design concepts like "pull to refresh" or the command palette.