We definitely have different experiences of cables.Don't have an answer for your directionality question. On directionality, all I can say was that when I swapped ends with the Supra, it was definitely much better one way than the other. I, like you, do want to understand why things happen or how they work, but in this case I really don't know. I guess contacting Supra may provide an answer?
Cable settling. I shall define what I mean by this. Cables don't like to be moved, so when you first put them in a system, they need time to settle. Even a cable that has 1,000s of hours on it like the Supra I mentioned above. It was fully burned in but had been out of the system for probably a year and so it needed some settling time to sound correct. I knew after a day or two, the newly inserted Supra 8+, that something was still wrong. And so I switched it end for end and after a little more settling, the sound was much better.
'My answer: nothing changes but your ears.' - I'd prefer if you not speak for me. I know my system quite well. I can hear any change I make and the one I'm talking about above wasn't subtle. That I can't explain why there was a change, of course also does not mean that it did not occur. Regards
I wasn't speaking for you, honest, I was suggesting a reason why you heard what you heard. Happy to learn from other directionality/"settling" theories, I just haven't seen or heard any yet.