I would not be against all of this (being able to change device while keeping all app data, including logins would be pretty cool), if it wasn't could based on Google's servers. No thanks.
Yup. If that was the case, I would probably use stock Android instead of using GrapheneOS. But no, Google insists on getting its fingers everywhere, so I insist on some inconveniences to prevent that.
I would love the conveniences that stock Android offers, but I'm unwilling to accept the privacy compromises.