The code at this point is not able to tell whether it was called as halt/poweroff/reboot or shutdown with time "now". The code also takes a shortcut to skip logind if called as root. That however means asking shutdown for immediate action won't trigger a wall message. As per https://github.com/systemd/systemd/issues/8424#issuecomment-374677315 all commands should trigger a wall message. That simplifies the code as we can try logind first always.
System and Service Manager
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