> a starting point overview

Which an unreliable answer is not.

> even if some details are off

Hallucinations are not a matter of some "details" being off. They are a matter of plausible, confident-sounding claims that are just plain wrong. They don't help anyone to get a "basic understanding". All they "help" with is getting a wrong understanding, that the poor person who's asking can't tell is wrong, because it sounds plausible and is stated with such confidence.

When humans do this, we call them "bullshit artists", and we don't view them favorably. Why should AIs get a pass?