Actually distortion measurement standards have been around for nearly 100 years and since the 1930s it's been understood that higher harmonics sound worse than lower, e.g.: https://www.bbc.co.uk/rd/publications/rdreport_1949_30
But this is not captured in buddy's SINAD.
The guys behind the AKG K1000, AKG K240 DF and Sennheiser HD250 II Linear are still around. If those guys would release a paper on how they measure and test, it would change a lot. Remember, the crazy AKGs were a serious thing.
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