Well, I'm generally very anti-LLM but as a library author in Java it has been very helpful to create lots of similar overloads/methods for different types and filling in the corresponding documentation comments. I've already done all the thinking and I just need to check that the overload makes the right call or does the same thing that the other ones do – in that particular case, it's faster. But if I myself don't know yet how I'm going to do something, I would never trust an AI to tell me.