I wonder how Apple’s wine fork handles this since presumably games are still expecting a 4K page on MacOS.

I doubt this will have much of an effect. Compositors already implement protocols that aren’t in upstream yet.

All this really is is putting some of those protocols in a GitHub repo and giving them a nice name. Gamescope will naturally implement them because frog works on gamescope. KDE might implement a few. Gnome and wlroots probably won’t implement them because (1) Gnome prefers a more lean set of protocols and likely won’t adopt a protocol until it’s “finished” and (2) Simon Ser, the wlroots main maintainer, is very involved with upstream protocols and would rather see development happen there.

This GitHub comment has the command to give Steam the permission it needs for VR.

https://github.com/flathub/com.valvesoftware.Steam/issues/898#issue-1222145279

Not out of the box, but you can make it work.

I use the Steam flatpak. The nice thing about that is that 32bit libraries aren’t installed on the host system.