[unilynx]

I do a full macOS reinstall approx 1.5 years, depending on external factors, mostly to be able to clean up obsolete apps/packages/etc (after the reinstall I move everything into a "Old machine" folder and only move back what I need. only drawback is winding up with an "Oldmac" folder inside the "Oldmac" folder inside the "Oldmac..." well one day I'll clear those up)

But I've never felt like needing to do that with iOS - the only 'reinstall' occurs when I upgrade devices (and then I restore from iCloud backup). What problems did you run into that were resolved by a clean reinstall of iOS?

[TheKnack]

Battery drain. I managed a big fleet of iOS devices around the iOS 6 to iOS 10 time period when battery drain was a common complaint (https://news.ycombinator.com/item?id=13054056). Completely wiping the phone and setting it back up without restoring the backup fixed those battery drain issues 100% of the time. If you wiped the phone and restored the iCloud backup the battery drain would persist because you restored whatever glitched config file was causing it.