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Now Ubuntu is Also Ditching Xorg Completely for Wayland!
(news.itsfoss.com)
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If everything is right, you won't notice any difference. XOrg is very old and insecure and Wayland isn't. That's the difference.
X isn't really insecure.
Isn't one of the problems with X that applications can log your keystrokes in other applications and record your screen? Obviously you shouldn't be installing compromised software, but who knows if Borderlands 2 now includes some malicious code in its DRM or something.