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 
But that would require writing new systems and handling more interactions instead of reusing templates and old code.
Games are meant to make profits and the more money you spend on slop that gamers are going to buy anyway, the less profit you make.