Isn't the point here that no-one has actually ever demonstrated there is an audible difference? Is that not what really matters?

It just seems a bit strange to me to discuss possible causes of an effect that hasn't been shown to exist. Even if someone could provide an uncontroversial theory as to why cable direction might make a difference, so what, if the difference can't be perceived?

It's like going into the back garden, doing a rain dance, observing that it doesn't rain, then going back inside to work out how dancing in the garden might affect the weather.