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…and all log messages queued at that point are fully processed and shown. And only once that part is complete, systemctl start -v may exit.

And the last part is the nasty bit: ensuring that all log messages enqueued at the moment the start operation completed are fully processed before we stop the log output. That's because journald takes log stream from a multitude of sources: classic syslog AF_UNIX, modern systemd AF_UNIX, stdout/stderr stream sockets, kernel kmsg and more.