This would mean that google intends to make it fundamentally impossible to backup an android phone, complete with app settings.
Why, I'm unsure, but I figure it part of the increasing lock-in and removal of openness in Android that Google has been trending toward for a few years now.
> fundamentally impossible to backup an android phone
... to anything other than Google services, I'd wager.
It's been tough backing up Android phones as-is. I have yet to figure out a way to get codes out of the Google Authenticator app other than via sqlite on a rooted phone.
Doesn't help you now but I can highly recommend AndOTP [1]. It's an opensource OTP app with support for encrypted backups/restores for your 2FA codes.