I think most non-Linux users haven't made a fresh install in 5-10 years. Preferences files and apps get transferred when you buy a new computer or update your os.
I was pleased how much was passed over from my last phone. I got the same brand so it's not surprising, but wow it is so much better than The Good Old Days (tm).
I remember the old days being surprisingly smooth. There was some verizon tool that transferred all my contacts from the dumb phone to my first smart phone.
