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RE: Quick question, where do you stand on wire and cable directionality?

Well assuming the speaker and amplifier are repetitively close so far as the speed of propagation in the cable (which is somewhat less than the speed of light) , the currents that flow in the two paths are always equal in magnitude but opposite in polarity. So in the sense of the cable, there is no direction.

And then there is what happens when you terminate a cable, copper oxide for example can be sort of a semi-conductor like a weak diode and can pass current one direction differently than the other direction. This is a metallic junction issue and not inherent in the cable.

The solution has generally been using a terminal strip with screws you tighten, which wipes off the oxide making a bare metal to bare metal contact. Even the old time RCA connectors were designed to scrape the oxide off and make good contact when you insert them.
That same oxide effect (and all the others) are more important higher in frequency than audio and is why many RF connectors are silver plated and a metal with less resistance than copper and who's oxides are not semi conductors.

So, like all the other stuff, it depends how much it effects the signal compared to un-transmogrified

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