I also keep my Windows gaming PC only for gaming. Reinstall it regularly, because this is the Windows way.
I have a DisplayPort USB KVM switch to quickly switch monitor, headphones, mouse and keyboard between my mac mini (that I normally use) and the gaming PC.
Win 7 and 10 have frequently ran into issues where updates fail to install for goofy and often inexplicable reasons. It is easier and faster to just reinstall that garbage without wasting time troubleshooting.
I have a DisplayPort USB KVM switch to quickly switch monitor, headphones, mouse and keyboard between my mac mini (that I normally use) and the gaming PC.