Shouldn't do much if you only have 1 other desktop. For example I used Pop!_OS for years which comes with Gnome, but I MUCH prefer KDE Plasma so I had that installed the whole time and just never touched Gnome (it was still there, removing it would have broken stuff).
How is it compared to AppImageLauncher? That's what I've been using for a few things that only ship AppImage.
I think your best bet is Gameboy emulation for gaming, that GPU isn't gonna be doing any 3D stuff any time soon unfortunately
Pokémon Blue on a used Gameboy color when I was like 8. All downhill from there.
You may need to move away from Ubuntu to an Ubuntu-based distro. Pop!_OS still packages firefox as a deb
Sounds like Steam and Proton may be broken. do sudo apt purge steam and then delete all your Proton prefixes in I think its ~/.steam/steam/steamapps/compatdata (the folders will all be game ID numbers) then reinstall Steam and try again. I'm running the game with the launcher on Pop!_OS 22.04 which is Ubuntu based and have no problems. However I set in the launcher to use Vulkan instead of DirectX
Update for anyone seeing this, someone has forked Infinity for Reddit into Eternity for Lemmy which basically 1:1 with Infinity, which was my go-to Reddit app! Its on on Codeburg with a version 0.1.0 at the time of this comment
"Gaming" distros, save for Steam OS as that's for a console-like device.
Pretty much every distro can play games relatively close in performance to any other distro. The only real difference is how new your GPU drivers are.
AMD is generally better