That's not my experience. I routinely get a polite "that might not be the optimal solution, have you considered..." when I'm asking whether I should do something X way with Y technology.

Of course it has to be something the LLM actually has lots of material it's trained with. It won't work with anything remotely cutting-edge, but of course that's not what LLM's are for.

But it's been incredibly helpful for me in figuring out the best, easiest, most idiomatic ways of using libraries or parts of libraries I'm not very familiar with.