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The technical merits of Wayland are mostly irrelevant
(utcc.utoronto.ca)
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And don't forget 1:1 gestures and the Crash-Resilient Wayland Compositing that keep the application alive even tho the "compositor" crash, so it does restart without any data loss.
Edit: forgot to mention the lockscreen protocol, because on xorg if the lockscreen crash then you view the desktop and you have the device unlocked!