I migrated from a 13 Mini to a 17 Pro last week. Updated the Mini to 26 beforehand to mitigate any potential 18->26 issues with data transfers/backups.
I'm still getting accustomed to the device size, the Mini was such a perfect device. If only app and web developers would actually preview their work on its dimensions, I probably would have just replaced the battery (76%).
Reduced Transparency is a hard requirement for iOS 26.