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Does Wayland really break everything? (Nate Graham's OG post ref'd in the Phoronix article)
(pointieststick.com)
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Many of those things you're thinking of were declared Somebody Else's Problem by said developers. That's fine, but Wayland was not ready for use by normal end users until somebody else did finish them.
From what I hear most of them actually are finished by now, but they weren't as of a couple years ago when it started becoming commonplace to see declarations that the time to switch to Wayland was Right Now. I tried it out then, and am as a result much less enthusiastic about doing it again now even though it'd be much more likely to go well.