Pikers, for a cable to be HDMI certified, it has to pass a battery of measurement tests. This means it needs to have a certain bandwidth, certian crosstalk, certain noise rejection, be able to carry a signal a certain distance, etc (I don't know the specs, and I'm too lazy to look them up). If it doesn't pass these measurements, it can't perform at spec, so the design must be made to do so in order to be certified. Regardless, all of the connections you use for video are audio were originally designed with stringent, measurable parameters. Listening/Viewing tests were not used to design the spec for RG6 cable. The same goes for any cable, or connection. There are reasons why video cables and terminations are 75 ohm, why speaker cable should have low capacitance, resistance, and inductance, etc.