Your current argument is just a reiteration of the player handicap. I know that isn't what you have addressed directly, but that is what it eventually falls into; making a significant change upon gameplay, which it simply does not, it's not like you're turning off the actual mechanic. once you become proficient at killing floor, the auto aim has quite an insignificant effect on gameplay outside of preference. It's not like a player is going to underperform if they have the option on as compared to off. Now you're probably wondering, oh if its so insignificant, why do you care so much to have it turned off?(which i have covered) So let me ask you, why are you so adamantly against having it be an option?
You all seem so convinced that making this optional is going to affect your gameplay. What i am trying to get you guys to see is that outside of your screen, you are not going to notice much of anything, and if you are gonna be toxic and blame a players poor performance on their game setting(or make a bad excuse as to why you're not performing well), then you are simply unreasonable.
Please give me an actual reason as to why it would have a NEGATIVE IMPACT ON THE GAME, not it would be weird to do this or that, that isn't a valid argument.