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Android will soon instantly log you in to your apps on new devices
(arstechnica.com)
This is a most excellent place for technology news and articles.
When I recently upgraded my phone I was surprised how little got brought over automatically and how hard it was to migrate configurations. If it actually copies over all my preferences from old phone to new phone, then great. If it's just logins then that's not really useful.
You have significantly more pleasent migrations when you use a custom launcher. Far as settings go Samsung S7 -> OnePlus 8 from what I recall got most of the settings I cared about. Notification settings for example, even app overrides