What’s up with all the negativity around flatpaks? I use Arch (btw) and I try to install as much as I can using flatpak. I think they are great. They are compatible, usually up to date, easy to install, easy to remove and it won’t break your system. The sandbox can be edited to include more paths etc.
If you want to play games then check out Nobara. It’s based on Fedora and made by the guy that created GE Proton