I think it is a bit unfair to pick on RA so much. On the other hand I think it is bad to say the cables are directional with no evidence but... lots of others do as well.

So lets compile a list of manufactures that claim their cables to be directional, can we?

AudioQuest (AFAIK, they have arrows on the cables)

Kimber

Russ Andrews

Cord

…keep 'em coming! - they are all full of... marketing!