If what you're trying to build is a perfect match for the full set of abstractions React provides then it's gonna be cleaner to use React than have AI re-invent it. But most cases I run into don't fit that description.

Have you tried using it in the case where React is actually a good help (very interactive apps)? And try to generate vanilla code for that as well?

Note that even "plain" JavaScript is very high-level with tons of abstractions. Most website features are one-liners that call into browser APIs where the actual implementation lives.