Here is yet another use for this:
Today I needed to punch into a mix I had done earlier, and then verify loudness targets. Since the loudness track doesn’t measure whatever we want, and since faster-than-realtime is currently broken, the obvious alternative was the “old” loudness plugin by Steinberg.
So, selecting an event (my new mix), plugin, and then the loudness plugin, IF the plugin window had stayed open I would have been able to press “process” and it would have measured the file, leaving the plugin window open with all the resulting values. At least this is my guess.
So, another instance where leaving it open would help very much.