

There is no reason they have to test it on multiple distros at all, the minimum and recommended system requirements exist for a reason. Just test it on one or two distros and list those as supported, treat anyone else the same way you would someone trying to play this game on an unsupported version of Windows like 8 or 7. If it works, great! If not - not our problem, figure it out yourself, your configuration is not supported.
Recent versions of KDE also automatically enable Do Not Disturb mode whenever you launch a full-screen window so you won’t get interrupted by a notification anyway! Honestly surprised GNOME doesn’t do that as well.