I'm not sure where you're getting the "any normal person" bit, since that's more or less the only thing I ever see anyone mean when they say "mature." It's hardly a conceit of CDProjekt alone.
I suppose you've got a point, now that people are co-opting the entertainment industry's standards for "maturity". ("Oh, you're 30? Sorry, babe. You're too 'mature' for the role.")
I actually wouldn't agree with you there, while they do include nudity in their games, the whole part of it which really makes it mature is the use and understanding of politics you must have. Games like the Witcher expects you to AT LEAST be mildly intelligent when making decisions. Their games don't ALL have to do with teenage six fantasies.
I somewhat agree with you here, but the "mature" aspects are really rather basic. It's nothing someone in their late teens or older would be wowed by.
It's like the difference between ... Terry Goodkind books and Robert Jordan books. (I'm not bringing George R R Martin into this, because I have no illusions about having that level of complexity in a video game for the foreseeable future.)
Bioware is Terry Goodkind, and CDPR is somewhere between Terry Goodkind and Robert Jordan. (George R R Martin won't yet exist for at least a decade.)
If they use Cyberpunk 2020's rule system (which system I hope has some kind of alley for finesse and diplomacy; can anyone verify this?) and spirit, then they might just be able to graduate to Robert Jordan status. But I'm not holding my breath, since, you know, CDPR seems to like the level of "maturity" it's at.
Which level of "maturity" is, as I said, dandy; but, again, it's not really "mature".
P.S. Hopefully that anology illuminated more than it confused.