@westcoastaudiophile I don't know of any high end/expensive/boutique cable manufacturers who provide testing measurements of their cables. I certainly don't know how the better sounding cables measure. Similar to my prior occupation as a commercial real estate appraiser (not to be confused with residential appraisers), my exhaustive work involved both science (math, computer models, physical inspections, details, interviews) and art (interpretation of non-physical elements such as location, effects of details on the adjustments such as environmental issues, etc). I provided reasons for all my adjustments, based on paired sales analysis and judgment calls (based on my experience and interviews).
So it apparently is with cable manufacturing, a mixture of science and art. I can't explain it. I would hope that manufacturers would do a better job of it rather than puffery. While most explain part of their cable construction, many don't, possibly due to proprietary construction limitations. Even some of the most expensive cables have virtually no information (MasterBuilt, sound great in systems I've heard but I have no idea why).