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 
Many games now have systems called aim assist and bullet magnetism. There's also some sticky-aim thing but i can't recall hwat it's called
aim assist nudges you crosshair towards enemies
bullet magnetism causes bulletsn or at least the hurt box attached to the bullet graphics, to fly towards enemies
and the sticky aiming thing makes you aim "stick" slightly when you go over an enemy, meaning you need to move it more than usual to keep going.
If done well the player gets a great deal of help from the computer to be gooder at shooting stuff, but it's subtle enough that you either don't notice, or can easily suspend disbelief and ignore it.