It takes real effort to have both consistency and diversity (you don't want everyone looking the same but with different colors) with AI art. At that point you can probably just hire an artist?
It will probably change in the future.
Nothing wrong with big dicks, but I hate when it has no impact on scenes. You have a monster dong but then you see a virgin take it balls-deep no problem? Dumb as fuck.
If peeps put that stuff in RPG games, I get it, but I can't really think of a VN that's actually made better by it. It's why I just avoid sandbox games these days.