it is NOT true that the longer the cord the lesser the quality.
there should be no interference or loss of sound quality. Theres also a myth out there that three 10 foot cords put together to make a 30ft cord will have less quality then just one 30ft cord, this is NOT true. They will have the same quality.
Sorry, but without rewriting physics, that's just not the case. As I agreed, running a balanced line you do not introduce the interference of mains hum, etc, but saying there is NO signal degradation in a long as opposed to short cable is just not true. The degradation isn't major with a good quality cable, but it's not non-existent.
Take the limiting case - in your words, a cable could be infinitely long without signal degradation - clearly untrue (or why would would I have spent hour after hour repairing booster amplifiers for the BBC? Or are they 'wrong'?).
Oh, and the connectors thing - every time you get an interface, you get the potential for degradation - interconnects oxidise over time, fewer interconnects to oxidise, fewer problems.
I appreciate you may not be sensitive to the differences, and that's fine, but saying entropy and cable capacitance don't exist/degrade a signal is naive, sorry mate.