I can't often detect differences with cables but can with some, especially paired with certain earphones. If it was simple bias wouldn't I think I heard a difference with practically all cables? Readily admitting to there being no difference in most instances to there being a clear (perceived) difference, which holds up after a few swops to make certain, is why I can't quite let go that (iem) cables make no difference at all.
I want to know the truth, whichever way that goes regarding my observations, and use the word 'perceived' as I have no proof and so cannot say there definitely is one, as some adamantly insist which is more intractable pointing to it being likely clear bias.