I too have an engineering background. I also have degrees in Physics and Nuclear Engineering. I enjoy seeing laypeople laugh at engineers.
True scientists are indeed skeptical. Google educated scientists jump on simple concepts and get it wrong a lot.
An engineer will continue to pursue improvements with an open mind as @vanson1 has.
I think the concept that is most often missed evaluating power cords is to look at the steady state/DC equivalent current requirements rather than the much higher currents that are seen for very very short times to support dynamics.
As for all the high-dollar cables mentioned above, they engineering behind them is quite well understood. It is in the marketing area where most of these manufacturers excel.
Jerry