Your toolkit should abstract all that away. We have these wonderful things called dynamic libraries, that X was designed for a world without because they didn't exist under Unix yet.
If toolkits can "abstract that away" they can do the same on X11 and there is even less reason for Wayland to exist. There is no reason for you to even care about X11/Wayland if you only work with toolkits. So stop participating in a discussion that doesn't concern you.
"they can do the same on X11 and there is even less reason for Wayland to exist."
Well actually it's the reverse: the more abstractions were put into toolkits, the more it became obvious that there was little reason to use everything in X11.