Registry keys and autoattend.xml config keys are not clever people finding a way, it's people using stuff Microsoft put there to do just this for now. I.e. Windows 11 has not been strictly enforcing these yet, they are just "officially" requirements so when they eventually decide to enforce in a newer version (be it an 11 update or some other number) they'll then be able to say "well it's really been an official requirement for many years now, and over 99% of Windows 11 installs which has been the only supported OS for a while now are working that way" at that time. If they just went straight from Windows 10 to strictly enforced Windows 11 options it'd've been harder to defend.