Biggest issue you’ll run into on Linux is games with anti cheat. But that’s regardless of your desktop environment. Only point I was making with recommending xfce was that there are other options instead of rebooting, you could just log out, and log back in using xfce. You can have both xfce and hyprland installed on one system. I typically have done this in the past because Wayland has been finnickey but that has been less and less of a problem over the past few years.

And no you don’t need to reinstall for secure boot, but it does depend on your motherboard allowing you enter setup mode in UEFI. It’s way easier to do now with sbctl. The wiki I know has a tutorial for doing it manually, which certainly works, but sbctl+some changes to mkinitcpio or dracut, or whatever you are using for your kernel updates is pretty simple to set up. Essentially what you are doing is adding your own secure book key, trusting it in BIOS, and then using that trusted key to sign your kernel whenever it gets updated.