It becomes important the moment your particular bug is on one hand typical, but has a non-typical reason. In such cases you'll get nonsense which you need to ignore.

Again - they're very useful, as they give great answers based on someone else's knowledge and vague questions on part of the user, but one has to remain vigilant and keep in mind this is just text presented to you to look as believable as possible. There's no real promise of correctness or, more importantly, critical thinking.

100% They're not infallible but that's a different argument to "they can't find bugs in your code."