You __can__ get good information from an LLM, however you just have to backtrack every once in a while because the information turned out to be false.
The problem is, how do you know? I've seen developers go completely off-course just from bad search engine results and one did admit he felt something wasn't right but kept going because he didn't know better; now imagine he's being told by a very confident but incorrect LLM, and you can see how hazardous that'll be.
"You don't know what you don't know."