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GNOME Moves On: What the End of the X11 Session Means
(linuxiac.com)
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The difference between both links is huge - one shows 7%, another 73%. Since I have no idea which is more reliable, nor I think this difference is due to time (the FF link is from 2022), let's go with your link instead.
73% Wayland means 27% X11. It's still a lot; not a big problem in KDE's case, since its developers are rather emphatic on still maintaining the X11 session. Can't say the same about GNOME.