No, it’s not a myth. Especially if you’ve been on the beta programme. Backups can not always) carry bugs and issues over. I always start fresh with every upgrade, for me it’s part of the hype and fun of getting the new phone.
I often find settings that I had forgotten about and enjoy the setup process. I only ever restore from a backup if I get a replacement mid-cycle. I always have amazing battery life by following this route.
