Comment by WorldMaker

The big situation is enrolling an Apple consumer device under corporate management, which Apple calls "Declarative Configuration" and others call things like MDM. Declarative Configuration can turn on Apple's support for attestation (and is today "the only way" to get Apple's official attestation support).

Declarative Configuration is also the thing that allows the controlling corporation to remotely wipe the phone and other such things where they own the phone more than you do.

I know not every person has the luxury of telling their employers that they will not install corporate apps on personal phones and that if their employer wants to own their phone they should pay for a separate work phone. But that is the big scenario to avoid attestation becoming more common in the wild, making sure people realize that "No work apps on personal phones" is maybe something worth striking about.