> Oddly, none of the LLM's I've seen ask for clarification when multiple assumptions might all be likely.

It's not odd, they've just been trained to give helpful answers straight away.

If you tell them not to make assumptions and to rather first ask you all their questions together with the assumptions they would make because you want to confirm before they write the code, they'll do that too. I do that all the time, and I'll get a list of like 12 things to confirm/change.

That's the great thing about LLM's -- if you want them to change their behavior, all you need to do is ask.