We need to recognize that the concept of bi-wiring came from speaker manufacturers, not cable manufacturers. Some of the most brilliant, and respected minds used real science to reach their conclusions. Based on my limited understanding, when a woofer is moving it creates back EMF, thus interfering with the upper frequencies. I would suspect this phenomenon can be measured, and validated. The concept of bi-wiring caught fire with the majority of "legit" speaker companies adopting it, and touting its sonic benefits. This may be the case of "mass duplification" (lots of people being duped) or some of the best of the best talent in the industry saw and heard something real here.
It is not the function of cable companies to debunk manufacturer's marketing materials and methods. If so, they'd rip them a new one for the crappy cables they use internally and their sonically degrading "high manufacturing/service efficiency" connection/termination methods. So, offering up a product that embraces a (respected) manufacturer's credibility position is neither blind, nor unethical. Just good business, based on a solid foundation.