This isn't relevant to users, it's relevant to developers. Getting rid of X11 is important, and if you don't know why it's not relevant to you.
The fact is that the design of X is archaic and not well designed for the needs of the modern era. The benefit to end users is that rich multimedia software becomes much easier to develop for Linux so they get more of it.
I'd like to use keycodes > 255 please.
Wayland has crippled customizability compared to X11. This customization is much more important to the user because, as you said, the improvements of Wayland are not relevant to the user.