Wayland seems like an odd entry in that list. It's mostly a strugle for people because it's not the monolith X was and now we have dozens or hundreds of different applications from different vendors to cover a subset of the functionality that was built in. In that sense X was the complex monolith that is extremely difficult to replace.

Also unlike the complaints about systemd in the article, Wayland is well suited to embedded. Automotive Grade Linux was an early adopter. It's desktop usage that has taken longer.