Your attempt at a logical correlation between the quality of the HD800 stock cable and the quality of the engineers at Sennheiser is a false proposition. You assume quality is the only design parameter. Certainly they could design a better cable if they wanted to, but they have to consider other things like cost, construction time, supply chain availability, sourcing, etc. Secondly, the cable's resistance is not applied to the headphone's resistance, it is applied to the load from the source. If the source is 1ohm and the cable is 0.1 ohm, you're essentially only getting 90.9% of the source signal. Drop that down to a 6ft 10AWG cable (i.e. 0.01 ohm) and you jump up to 99%. Third, insertion loss is not uniform across the frequency spectrum, so you can't just "turn it up", as you say. It will affect all different kinds of variables from FR, to soundstage, to imaging clarity, bass impact and more. It's not insane nonsense, it's basic math and science.