This is different than my understanding of Google and Apple. Could you provide links to sources showing what Apple collects about its users?

Yes

Darwin. Their BSD and the foundation of MacOS and therefore all the current OSes they produce.

MDM would have been used regardless of OS.

I see what you’re saying. I agree that users should be able to remove device locks remotely. You can with iPhones. Hopefully that moves to all devices.

I still prefer this to not having the lock at all.

Your post details how it isn’t possible for IT professionals to wipe a Mac without the consent of the owner’s account. How is that security theater?