The question was related to the relative difficulty of replacing the whole graphics stack vs. patching in support for an X extension that has existed for longer than Wayland. One of these things is far, far less work than the other.
As someone who has done both, I respectfully disagree.
I call bullshit. If you had done so, you would have shared links to them to prove your point.
There's no code I can show you that would be any more convincing than just looking at the code to the X server and then looking at the code to any wayland implementation. There's not anything particularly special about these projects.