i don't know if you've ever seen professional competitive fps gamers, but their aim and hearing can be insane. they're almost equivalent to an aimbot. They can react in a hundred milliseconds and then lock on a head to such an extent that it really does look like a lock-on. When the enemy moves very fast they can still predict enemy movement based on their player character's animation, keeping the lock-on. Flying enemies are at their mercy as well, because they fly in a predictable arc. They can perfectly counter weapon recoil patterns because they've trained on them. I know there's the valve approach of banning cheaters based on suspicious behavior, but at an extremely high level it's almost impossible to separate cheaters from extremely good players, especially if the cheating gets more subtle. I really do dislike kernel anticheat and I use linux myself, but there are reasons for it.