Earlier quoted context omitted.
> It is actually one of the big, unfixable, conceptual problems of Wayland Why not have a shared implementation?
Because then you end up with something like X11, which we already have. The codebase could be re-engineered, sure, but a lot of people championing Wayland tend to see this duplication of effort as good for some reason, and at least last I engaged with them did not like the idea of a "new X11." Personally I think something like that is an inevitability.
People seem to like that we have many browser implementations but when it comes to display servers it seems like they want Chrome to rule them all.