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

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It's even simpler than you're making it out to be, @David A. The fact is that if people are hearing a difference in sound quality and report that in good faith, there is a difference. Equally, if people are not hearing a difference, there is no difference. Both statements are equally valid and do not conflict, because we're talking about a subjective experience.

If one wants to determine whether there is an objective cause of any reported sound quality differences, that's another story entirely, and -- as I think you acknowledge -- not something that can be resolved by any amount of uncontrolled, individual listening reports.