The value prop is crystal clear.

It is, and there is definite demand. Just, not at that price. And when it comes to deep debugging, LLMs are not a time saver versus doing it manually, also not when you know what you're doing, so time will get spent. The difference is that an experienced coder will do in a day what will take a non-coder with an LLM a week or more, with much more precision.

What kind of apps are people building?

Mostly specific small webapps and data pipelines that do work but are buggy. The grand visions don't really get anywhere, so I don't see them.

The simplest, most bitcoin-adjacent one was a dude that wanted "pretty" QR codes for his LN invoices on his wordpress site; combine png data basically.

Or for example someone wanted to automate away Excel and go from a csv file straight to a html report (that python code was slop soup and was a headache to make sense of, due to too many iterations by Claude)