"Better" is in the eye of the beholder. DLSS 5 is optional, as are the shader and texture mods that are available for many games for ages. They both change the look of the game in ways the people creating them didn't intend. I don't really care about what the creators of games intended, I want to have fun playing it, and I'm okay with changing/modding the game until I have more fun. That is "better" to me.
DLSS5 probably doesn't matter to me anyway, since the Nvidia together with their AI business centipedes actually don't want to sell GPUs to consumers anymore.
(If you downvote, I would be really interested in hearing your argument. From my POV you either dislike people modding their game, or are a hypocrite. If it is about hating Nvidia and the current AI bubble, I'm with you there.)
Maybe just put all roms and savegames into a syncthing directory?
It's not really multi user, since everyone has the same savegames, but maybe a start?
Or are you more talking about streaming games centrally to a display?