You seem to be missing the forest because of all the trees in your way. The statement to not use Manjaro has nothing to do with KDE or any other DE/WM and everything to do with the development of the OS.
Manjaro has a history of being sloppy especially with web security. The reason people suggest Endeavour has the same goal (more user friendly arch) without some of those drawbacks.
I wouldn’t say wrong - but there’s probably some nuance you’re overlooking. As a general rule healing is not super strong in D&D so you may want to forego having a dedicated healer, you also might want to focus on “control” spells that can either take an enemy out for a few turns or otherwise minimize their threat.
There’s also an argument to be made for preserving the “hardware” - those machines don’t last forever. the Analouge guys recently made (or are making?) an FPGA that is compatible with all of the Turbografix hardware paraphernalia which is arguably just as important as the actual software