[roryirvine]

Yeah, and it's been like that for years - the past decade, at least.

I've had a couple of Nexuses, a few of the Pixels, with a Nokia in the mix too. Never any problem - just log in, wait a few mins for the apps to automatically install and the data to backup/restore (which, iirc, happens over local wifi rather than going through the cloud). The last upgrade included a separate work profile managed by MS Intune, and that was also smoothly handled by the upgrade process.

Yes, Whatsapp chat history has to be handled separately (as others have mentioned) because of the e2e encryption. The only other thing that needs doing is confirming that I want Firefox as my default browser when I first run it. Otherwise, it's all completely hands-off.