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So let’s talk about this Wayland thing
(pointieststick.com)
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For 1., the big issue is that there constantly are appearing new standards in display technologies. Two semi-recent examples are HDR and VRR, both of which X11 struggles with, and implementing those into X11 has been said to be painful by its developers.
This is an excellent counterexample to claim 1, and I wish this was the top response to my comment. It not only negates the claim that "maintenance mode" isn't bad, it also provides specific examples of when it is bad.