I look at it like this: there are probably a hundred variable involved in sound quality that the human ear / mind can perceive and only ten or so have measurements. So there is enormous room for variability. We are only measuring the big stuff.
There is reproduction of sound at each frequency, how different frequencies interact, attack and decay... it goes on and on. This is why after my first couple years in high end audio I stopped looking at measurements (with a few exceptions on amps and speakers) and just listen or read the qualitative stuff.
Just a couple comments about myself I was trained as a scientist and worked as such for ten years. I am always a scientist at heart... I have a home seismograph, weather station, pollution sensors. I track all my vital health variables, blood pressure, heart rate, VO2...etc. So, I am very pro analytical when it is useful... it is not very useful for high end audio.