It is being discussed because we’re in the middle of the transition from X to Wayland. Before there wasn’t much discussion. In a few years when it settles out there probably won’t be much discussion.
Windows and Mac have never had a choice. There might have been significant changes to a window manager layer, but it would have been part of a larger version upgrade. Like between windows 3.1 and 95 or OS 9 to OS X. The visible changes would be closer to desktop environment like KDE and Gnome in Linux.
Doom 2016 plays well on almost anything. It was the beginning of the self scaling graphics and rendering to maintain high frame rates.