Are they advocating for that? I thought that, for example, doing a secure boot from a trusted disk image, and consequently not allowing to touch any system-critical components, as well as a good process sandbox model could ensure that cheating is very, very hard, undetectable cheating even more so - and the rootkit-like behavior of anti cheats could be constrained to the sandbox - let's say that the anti cheat software replaces common software libraries with introspectable versions with something like OverlayFS, but since the whole game runs in a Docker container, it cannot affect the rest of your system.

Generally speaking, I was also livid when I learned about how Riot planned to solve cheating in Valorant with it's own rootkit - and I think Microsoft isn't crazy about the idea either. My two cents are on this being one of the major reasons MS decided to make TPM mandatory for Windows 11.