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GTK Drops X11!
(news.itsfoss.com)
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The older versions will still stick around for many years; it just means apps specifically targeting GTK5 won't support X11.
In any case, X11 has all but been abandoned already so the writing is on the wall.
Things must move on eventually, I suppose. I just really hope they reach feature parity before then. It sounds like most of the annoyances that have kept people from migrating are being tackled, so I'm hopeful.