Anything that improves your gameplay should enabled through a Perk or Point System.
Aim Assist is a handicap item, so therefor it should be treated as such.
People should aim based on their own skills, and I see a lot of you do. But I know there have been times where a guy may have been ADS and you Ran Past him really quick and the game automatically Aimed on you.
So if people get this free boost to their skills, it should be use up some slots. I for one prefer a perk that disables Aim Assist from locking on you.
Should this be implemented in this way.