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The background

I was to get informed about the state of Wayland adoption by Ubuntu, when I learned it's not any more an option and there is something named Mir in the place instead. So I wanted to learn more about the reasons.

The question

The page MirSpec at wiki.ubuntu.com says:

With respect to shell development (Unity), three major shortcomings of the X stack prevent us from delivering the user experience (f’n’f) we have in mind:

  • X shares a lot of system state across process boundaries. […]

I could not understand the sentence I underlined in bold, which seems to be an important point understanding both X and Mir.

Is there any kind of practical/concrete pictures to explain what this statement means?

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