So, why isn't this a thing yet?

[Nestama]

Kurogaea... you can already play as a teenager looking character in this game (if the race can be short, or have a young face). When I say playable children, I mean characters who are quite clearly between the ages of 5-12 (such as the Miqo'te girl that this entire thread was created for).

I doubt it, it seems like they've just bumped up some games that would have normally fit into the MA15 rating before R18 was introduced. Even then they don't trust their consumers enough to allow for games like Hotline Miami 2 to be available, R18 or not.

I think it would have been banned outright just because of certain parts in the game... particularly during the winter season of the game. Those death scenes were... I was not prepared for them at all (plus the implied... urgh, that guy was just creepy and horrible and gurgh).