Are you employed at Google or OpenAI? Are you working on these frontier models?

In the case of medical questions it needs to know further details to provide a relevant diagnosis. That is how it was trained.

In other cases you can observe its reasoning process to see why it would decide to request further details.

I have never seen an LLM just ask questions for the sake of asking. It is always relevant in the context. I don't use them casually. Just wrote a couple of handbooks (~100 pages in a few days). Generating tens of thousands of tokens per session with Gemini.