This is because Wayland wants to differentiate itself from X on security. Wayland has to show it's more secure than X - as part of that, Wayland has to show that X is insecure.
No, wayland already differentiates itsself from X11 because X is a tool for graphical network terminals and Wayland is a tool for single machine rendering.
X11 is a mountain of tech debt that almost nobody wants to maintain.
Wayland is what you get when you decide to start a space program because, let's be honest, the electrical gremlins in your 1983 Mercedes 560SL are beyond properly fixing, and the kids still need to get to school
