The very fact that the HHT is measured with human hair makes it completely unusable to compare findings between different persons. My HHT4 could be a HHT3 or HHT5 for you. Given the non linear differences between hair, there is no way to calibrate the HHT levels in a meaningful way. HHT can be a predictor for shave quality for an individual, but nothing more than that. And whether a razor needs a touchup or not can be determined easily by just shaving with it.

As for being threatened... not really. HHT is discussed again and again. I think it is more annoyance by people refusing to first read the old threads before they start new ones trying to rehash the same discussion yet again. By the very nature of the test (using wildly varying types of hair) it is a stupid way to compare edges between different persons. And for using it just for you: sure why not. But then you just have to figure out how the test correlates to shavereadiness for you.