I had to do this twice while debugging issues with my iPhone 6s right after launch. Turned out to be faulty hardware and they replaced it. It took about 6-8 hours each time to get it back the exact way I wanted it, so I was pretty annoyed that Apple support would ruin my weekend like that. There are a lot of Wi-Fi, email, apps, and documents to replace for some users. For apps and games that don't use cloud storage (which are becoming few and far between nowadays), you don't get that data back.View attachment 704145
All iOS releases have been very stable for me, maybe you should try setting up the phone as new and don't use a backup to bring along crappy data.
A trick I learned at the genius bar is that they fix most people's problems by resetting all of their device settings. So they still have their apps and data, but just have to setup all their various logins and personal preferences. That trick gave my iPad 2 new life several years ago. Sometimes you can even fix it by just resetting network settings and not all the settings, so I usually do that to fix minor issues that friends and family are having with their iOS devices before resorting to a complete reset.