From 1986 through 2001, I was a programmer working (almost) solely on digital communications, so it's often trivially easy to recognize silly claims about cables, etc. OTOH, 100% of this work was with cables with didn't include a separate power conductor. I had considered only the recovery of the digital signal in my claim.
Thanks. It's good to learn something new.
I see, a good background and perspective then. Well, I hope spelling out some of the concepts and writing the extra words weren't wasted, as there are other readers too.
But in this kind of situation, do we really call it the digital communications that's making the difference? It really isn't. It's the analog considerations of the cable (maybe also taking a loose definition of a "cable" possibly including passive circuit elements like ferrite beads) used for the digital communications.
Usually when we think about digital communications, we're just interested in digitized data getting from point A to point B, maybe in a timely fashion or with some reliability, etc.