The remaining issue is that even an AI-generated UI needs considerable UX input in order to work well, especially when you have to fit it around domain specific knowledge, use-cases, and prior art. Is it for power users or not? All that.

At risk of shifting the goalposts on what I originally said, unique here isn't meant to mean quirky or weird but, simply, something that hasn't been done before, or hasn't been done as effectively.

This is the challenge for B2B startups that are switching to LLM-based development and are trying to offer more than the reselling of cloud compute at a markup with specialised functionality, because AI turns SaaS into a sexy version of MS Access.

Exactly. If I am making a tool, I want the users mental energy to be spent on their domain, not bespoke weirdness of my ui choices.