So, if you dealt with a person who knew all the vocabulary related to a field, and could make well-constructed sentences about that field, and sounded confident, it would almost always mean they had spent a lot of time studying that field. That tends to mean that, although they may occasionally make a mistake, they will usually be correct. People apply the same intuition to LLMs, and because it's not a person (and it's not intelligent), this intuition is way off.
There is, additionally, the fact that there is no easy (or even medium difficult) way to fix this aspect of LLM's, and it means that the choices are either:
1) ship it now anyway and hope people pay for it regardless
2) admit that this is a niche product, useful in certain situations but not for most
Option 1 means you get a lot of money (at least for a little while). Option 2 doesn't.