Yes, Tim Cook could flip a switch and my mac would become activation locked. Considering that Windows 11 has been working really hard to sneak remote attestation below our noses (and other stuff), I think it's safe to cross out Windows as well.
As long as Microsoft wants to keep Windows compatible with user-controllable hardware (like computers that let you disable secure boot and TPM or enroll custom keys), there should always be a way to debloat Windows.
Microsoft doesn't care that much about user-controllable hardware, not as much as they used to. Their partnerships with OEMs have grown very deep and they managed to push Pluton for any device that wants to be certified for W11. They could go a few steps past this in a few short years.
True, Windows will never be as locked down as macOS that only runs on Apple designed custom ARM hardware. I guess my skepticism comes from my expectation that my Windows computer should be able to run games (unlike my macbook which holds personal data and work), and remote attestation is going to be used first in anticheats.