Is there a write-up of the critique of this issue?
I read the Waycooler blog posts but they didn't go into details.
In the last 15 years, that assumption has broken. People want to write applications specifically avoiding C/C++ and even Gnome/KDE.
Wayland has not adjusted to this new reality. It is not clear that it may even be able to.
The problem is that this kind of graphics system programming is a gigantic pile of work while being very fiddly with non-obvious details that you have to get correct. Very little of it is "fun" and the people qualified to be doing it are capable of earning a lot more money doing basically anything else. The fact that almost exactly the same people doing Wayland were the ones doing X11 previously shows that nobody is jumping up and down for the chance to attack this.