Yeah, that makes sense. It seems like instead of introducing another IPC protocol like this project does, there could be a compositor that loads different window managers as plugins. Then everything is in the same process and there is no need for async communication. Of course a crash in the window manager would take down the compositor, but this is already true for Wayland compositors that combine both.

This also means low-performing clients can make the whole Desktop stutter/freeze and it is one of the many reasons the Wayland architecture is beyond idiotic. High responsiveness is obviously far more important than avoiding the occasional artifact.