Completely and utterly made up Headcannon logic. Stats prove that the nerf barely made a dent.
https://www.reddit.com/r/apexlegends/comments/1ilodod/i_performed_mnk_vs_controller_statistical/?sort=new
post nerf aim assist and buffed no aim punch (which was a bigger issue for mnk) and controller is still 23% more accurate than MNK and in actual stats, rollers effective accuracy only went down 1% while mnk´s went up 1 percent. KDA is still the relative same 0.28 difference of roller dominating.
AA needs to be completely removed, in pc ranked and pro play or potentially heavily remade, 0ms instant reacting AA is what makes it so insane up close, when humans need 0.2ms to even react to most enemy inputs.