Greg, thanks for the clarification. I was under the impression (from a short-lived Wayland/(Weston || Sway) adventure about 1.5 years ago) that each app started its own compositor. Some discussion on the Sway github led me to believe that, IIRC.

As an interested user, I wonder if using a group named 'weston-launch' is the best thing to do. My alternative thought would be to use something like 'wayland-launch', since there are two popular compositors today (weston and sway), and may be more in the future.