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Differences between Wayland and X11
(lemmy.ml)
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A shorter take: x11 is old, and big, and didn't originally consider security much at all.
Wayland is newer, therefore lacking some bells and whistles of x11 that some x11 users may still care about, but also designed with more awareness of security issues - making it more extensible and maintainable into the future.
There was a time Wayland wasn't a great x11 replacement due to its level of development. When it will become the better choice all depends on what kind of user you are, but it seems inevitable to become the better choice for most users in the future.