I didn't really point much out. I only know that multiplayer games use either Steam or GOG Galaxy to log in and that there aren't many more OpenXR runtimes besides SteamVR on Linux (I know of WiVRn, but I had an Nvidia GPU and couldn't figure out how to compile the Vulkan extensions required). I find it tedious to manually set up save file synchronization for my GOG games, so I really can't be arsed to go so far when Steam just does it all for me.