Emacs is generally used as a normal program that connects to a Wayland compositor (Wayland speak for window manager). The idea is to instead make Emacs behave as a compositor, essentially connecting directly to Wayland and bypassing other window managers.
Correction, normally it connects to x.org.
In the current context, "normal" would be Wayland. Of course, most people use X (and it was the only choice until 29).
What would be the advantage? Performance, or just because it’s neat?