I poked around in the registry a bit too much awhile ago and managed to delete my only user. Oops! Completely bricked my install, couldn’t even unfuck it with safe mode shenanigans. Had enough space to clone my entire drive so I just lost a couple days of time fiddling with it, only a couple hours actually copying my shit back and forth.
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