I don't think it is possible to have "good implementation" of cable impedance sensing, given the inherent properties of the connectors. Wetting current is a thi

I don't think it is possible to have "good implementation" of cable impedance sensing, given the inherent properties of the connectors. Wetting current is a thing, after all, and it can be quite big for work connectors. Cable-reported capacity does not really change over cable lifetime - the currents used to sense resistance are miniscule, and would not be affected by cable being worn. For example, extra 0.5 ohm of cable resistance completely ruins the current sensing, but make absolutely no difference when measuring 5K or 1K resistance. And if manufacturer is lying, that's annoying but it's 100% deterministic - you know the cable is bad, you can throw it away. With impedance sensing, the same cable can be good or bad, depending on the mood, and that's why it should not be used ever.