First. Let me state that i am completely convinced that the speaker wire issue is in reality a non-issue. It is well known that the measurable differences between cables are very small.
That said, I don’t think the argument that there is no known scientific proof that has shown differences I speaker wires is a good one. It may point to the conclusion that there are no real differences, but is that really proof?
In others areas of home audio it is taken for granted that real audible differences exist. For instance no one ever debates if CD players all sound the same. At least most enthusiasts seem to agree that the differences are really there.
However can someone point to a real scientific study, comparing reasonable* CD-players that conclude that it is possible to distinguish different players in a blind test? IF not, is that then proof that there are no differences and that all players sound the same? To my mind not. You may differ?
*Reasonable to my mind is not super cheap crab vs. the best of the best or weird contraptions etc. vs. good honest CD decks. Catch my drift