The Windows shift/update doesn't need a backup either. Works like you mentioned. I believe he is saying certain apps need to be signed in again not restored from backup.AHHHHHHHH there we go! We have a traitor amongst us cross breeding with his products. Only joking.
I can’t speak for Windows, I would of liked to have thought that process would be universal, but could be the reason your getting promoted for a back up.
if you were on a mac, put it on the Christmas list, you don’t need to use a back up and your iOS gets wiped off and reinstalled quick and easy. If I’d known that early on, I would have instructed you slightly differently. 👍🏼