Would you like it if Bethesda made it possible for your character to complete every single mission you can in the game without killing anyone yourself?
I mean you could still beat up and bludgeon enemies to the point of unconsciousness or sit back and watch your allies or other enemies kill the enemy so long as you do not actually kill them yourself. Not sure if this was possible in previous Elder Scrolls and Fallout games, but with games like Deus Ex, Dishonored and Thief giving you this option I think it would be pretty great to have it be possible in Fallout 4.