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 
You do a contextual animated thing. Games nowadays can blend animations to alow you character to move much more dynamically, shift between poses while doing other actions, interact more distinctly with the ground or objects instead of being a capsule attached to a plane. Hd2 does it quite well.