VNC does desktop sharing. That's useful, but very different from remote desktops. Wayland's lack of the ability to do actual remote desktops is the showstopper for Wayland for me.
I'm not sure where this hair is being split. How do you distinguish "Remote Desktop" from "Desktop Sharing"? Given that both VNC and RDP are defined as "Remote Desktop Sharing" software, how are they not alike?