Are we there yet, Mom?

X support has not been removed. The XFCE devs put in place an abstraction layer to facilitate working with both display servers. However, as others have noticed, Wayland support is still spotty and experimental in XFCE 4.20.

Personally, I'm not looking forward to the move to Wayland. For my end-user purposes, Xorg is just fine. I'm very glad that the XFCE devs are offering a path to having a choice of display server protocols, though I know it may not last.