With the way most distros are structured, you should never need a reinstall, since reinstalling the packages will fix any issues with broken system files. Broken configuration wouldn’t be as easy to fix, but still something you should be able to fix.
The only reason to be reinstalling, in my eyes, is if you have a mess of packages and configuration you don’t remember, and want to get a clean slate to reconfigure instead of trying to figure out why everything was set up in a certain way.
With the way most distros are structured, you should never need a reinstall, since reinstalling the packages will fix any issues with broken system files. Broken configuration wouldn’t be as easy to fix, but still something you should be able to fix.
The only reason to be reinstalling, in my eyes, is if you have a mess of packages and configuration you don’t remember, and want to get a clean slate to reconfigure instead of trying to figure out why everything was set up in a certain way.