Version: Firmware 13.1.3 + DOS 2.2.4 Date: 2019-02-12

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Saying that there is a difference in the sound is reporting a subjective experience as you say, but you are reporting a subjective experience which should be able to be verified by objective testing.

No, there is no requirement that a subjective experience should be able to be verified by objective testing.  It may be caused by any number of factors which may or may not include objective causes.  Hearing doesn't always give the same (subjective) experience for the same (objective) stimulus.

So, once we start talking about testing in order to verify reports that say something is producing a difference in sound, we have 2 ways of verifying that statement. ...

There are problems with both of those sorts of tests...

Agreed.  I'm not arguing that such tests need to be done, because there is no need to validate a subjective experience.

Sorry for the long post but the issues aren't quite as simple as your questions seem to suggest.

That sounds a touch condescending, if you don't mind me saying.