They excel at remembering data but they often fail in applying all that data to reach any logical conclusion.
In other words, they are sort of a big, expensive, power hungry, talking hard drive --- which is a technical solution looking for a problem in a lot of cases.
It is somewhere in between Crypto and dot.com as far as bubbles go, and as open models catch up with closed source ones, it seems less and less likely that yhese companies are ever gonna make back the monry they spent, at least short term.
The truly disheartening aspect is the fact that so many technical "leaders" have bought into the hype and are throwing huge sums of money down this rabbit hole. It's not like we haven't been through this sort of thing before.
And many seem convinced that these talking databases that can't do simple math are somehow a threat to society. This is an insult to humanity in more ways than one.