In terms of gameplay mechanics, old school zoom aiming achieves the same thing as ADS. Is getting to press your nose against virtual firearms really that important in a game about shooting werevolves and vampires?
I blame this on the proliferation of Call of Duty over traditional scifi and fantasy shooter franchises. You can fucking ADS on an assault rifle in Halo now 
Arma allows you to do that, too. And some mods add a safety!
There's a vr game called Breachers where your movement speed is partially decided by how you hold a gun. Holstered is fastest, then low ready, then high ready, then shouldered and aiming. The game does it dymanically based on how your vr hands hold your vr weapon.