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).
A PS4 can be jailbroken to run Linux. You can then install Steam and Halo and have Halo on Linux on PS4