How is not properly setting up the session, and preventing root from
showing things on the display, "for security"?

root, by definition, has the ability to do anything anywhere on the
system. Including reading and writing other users' files; reading and
writing the memory of processes (and FD's and environment and ...) from
other users, etc. Adding extra steps is not security, it's just making
things more difficult for users.

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https://bugs.launchpad.net/bugs/1652282

Title:
  Xwayland not using XAUTHORITY, prevents root applications from
  connecting

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