I might be mistaken, but both need a physical monitor turned on. If your monitor goes to sleep you can't connect/see a black screen.

The kde one doesn't support remote user login, and while the gnome one does on paper, I never got it to work. The remote connection situation in Wayland is a major regression.

Yeah that's fair, the KDE people have remote login as a goal but it's not there yet. Waypipe is definitely the more mature option at the moment if you need a headless workflow.