Wayland has lots of potential, but it's far from ready to replace X11, especially in multitasking environments. XFCE is taking their time, because their community is more very concerned stability.
I predict that XFCE will default to X11 until Wayland has reached broad feature parity, then default to Wayland but keep X11 support until the last vestages of incompatibility are delt with.
There's no reason that this wouldn't be accepted by their community, and it should be lighter weight, in the end.
Wayland has lots of potential, but it's far from ready to replace X11, especially in multitasking environments. XFCE is taking their time, because their community is more very concerned stability.
I predict that XFCE will default to X11 until Wayland has reached broad feature parity, then default to Wayland but keep X11 support until the last vestages of incompatibility are delt with.
There's no reason that this wouldn't be accepted by their community, and it should be lighter weight, in the end.