quickscoping definitely shouldn't be removed from pc, i don't know if you're referring to just the xbox or including pc as well but removing it from pc would be even sillier than console
if that ever happened then it would literally be useless to use a sniper in any situation whatsoever since pc is more fast paced and people in general have the ability to be more accurate with a mouse+kb at longer ranges than usually
and smg's do really not have that bad of a time to kill at long range - it's just dealing with the recoil for most of them, and honestly even then it's entirely more consistent and easier to do than constantly sniping in cqc