I don't think that that is disputed. Isn't it going to be a fact whether we are connecting a $20,000 power amplifier or a kettle? It is going to be basic electrical/safety practice to use cords, connectors, etc that can easily carry the maximum current that is likely to be drawn, which is going to include peaks. We see this easily in the starting up of a refrigerator or AC compressor, or even a laser printer. The engineers can say that that is an entirely different kind of load, but it is still a peak current draw --- large enough, for instance, that most domestic UPSs will not support a laser printer.
I don't think it id disputed that we need to accommodate peak loads to our audio equipment, even though it has power supplies that include power reservoirs.
Current drawn is not ephemeral, it not some sort of half-unknown unmeasurable of the nature that audiophiles love because they cannot be denied.
No argument at all with decent quality cables, known to be somewhat over-spec for size/resistance. No argument with good plugs, good contacts, good cable termination under the covers. I wouldn't mind buying such cables for the fridge, let alone the hifi. As for sockets, I'm fed up with replacing them because they just don't grip. Guess what: I buy my plugs, adapters, etc, in Singapore. Is this excessive? It's partly because I often need the British/Singapore flat-pin 13-amp-plug pattern, but also because I just don't find local stuff to be as good.
But What of the exotic market? Does anyone publish numbers. test results, to show that their power cord is superior, and in what way? If they do, are they honestly presented, not marketing-dept-massaged to look good like the popular speaker market does to decorate its boxes?
This is basic electrical engineering: they have either produced a better power cord or they have not. Basic engineering works by numbers, not faith.
But of course: I have to buy it, I have to try it, I have to hear it, and my wish for basic engineering honesty is all crap, because, even though all the other devices in our lives work by pure science and technology, audio devices, somehow, just ...don't.