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What I mean by that question is whether Wayland is (or intended to be) compatible with the protocol between X Server and X Client or not.
If it is, then why do we need another GTK backend? Won't the normal X backend work? Won't normal X clients be compatible with Wayland?
If it isn't, then stop calling it an X server. It would be a totally new protocol that's incompatible with X protocol.
Please note that my usage of the word "X" doesn't refer to any particular implementation of X like X.Org or XFree86. I'm talking about the X protocol.
What I understood, is that Wayland doesn't "speek" X protocol. It's a local display server for everybody PC. Once an X server run on top of wayland (as a wayland client), then any X clients could run on wayland (using GTK, QT, ...).
Porting GTK to wayland allowed GTK client to run without the X Server layer.
I admit than if the rootless X server run on top of wayland, may be it's not necessary to port GTK. Maybe it has something to do with client rendering. Don't know.