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 (and helldivers 2) is fun because the bullets come from the barrel of your weapon instead of the center of the camera. Doesn't matter where the weapon is pointed, so bullets can do zany things if you fire while running, or are firing when you get shot or stunned.