Its a PC problem because process memory is not protected from other processes or the kernel. Kernel anti cheat completely stops userspace cheats from working at all. It has problems with cheats abusing drivers or DMA based cheats, and of course hardware that only acts on your monitor output and adds input to your mouse. Your argument seems to be that it is not bulletproof therefor we shouldn't use it and allow simple userspace cheats like cheatengine to work again.