I mean, even that doesn’t stop aimbots. They’ll just snap directly to the enemy’s head as soon as they’re visible. If anything, this would make programming aimbots easier in several ways, because a big part of programming a good aimbot is figuring out how to prevent snapping to enemies through walls. If the server is already handling that, the aimbot won’t need to bother with it.

If anything, a stupid simple method of server-side aimbot detection would simply be to create phantom player locations. Like randomly generate fake player locations without any character models. Invisible to regular players, but anyone who snaps to that fake location just got busted for aimbotting.