Well, dummy plugs are also kinda useful on windows - can’t seamlessly switch to client’s resolution without setting up the resolution profiles first, and that requires a device to apply the profiles to.
Also, you can create virtual displays fairly easy on Xorg, but yes, the entire sunshine setup is infinitely easier on windows.
I’ve been hosting grist for a while and it is quite nice. Wasn’t able to move all the stuff from classic spreadsheets though