What makes you think that I think kernel AC is a silver bullet? I’ve said in pretty much every comment here that cheating is an arms race and there’s no silver bullet.

Taking the defence in depth argument - kernel AC is another layer that helps and makes it more difficult for the cheaters. But some defences are more crucial than others - you don’t use MD5 anymore for security because it’s just broken. IMO, the same can be said about user mode anti cheat.