One of the long-time work-in-progress patch series has been realized in time for next month’s GNOME 3.34 release… Mutter when acting as a Wayland compositor will allow starting XWayland on-demand, or rather only running it when needed to handle an X11 client/application…

Source: Phoronix – GNOME 3.34 Now Supports Starting XWayland On-Demand