It depends a lot about the ratios here. There's a fast flip between "interesting but useless" and "useful" when the tradeoff flips. How fast can you check the

It depends a lot about the ratios here. There's a fast flip between "interesting but useless" and "useful" when the tradeoff flips. How fast can you check the contribution? How small of a part is it? An unsolicited contribution is different from one you immediately directed. Do you need to reply? How fast are followups? Multi-day back and forths are a pain, a fast directed chat is different. You don't have to worry about being rude to an LLM. Then it comes down to how smart a frontier model is vs the people who write to mathematicians. The latter groups will be filled with both smart helpful people and cranks.