I have been listening to music since before a 45 watt ss amp was the biggest baddest thing around, a Sansui AU999, for those who remember.
Graphs, are indeed a point for noting and do indicate basic paramaters for measurement, squarewave formation, slew rate, etc. There is though a basic and real diffeence between measurement and music.
I cannot prove this, but I believe with enough info it would be quite able to get two different amps, even different types of amps, at equal wattage whose reaasurements were commensurable but whose sound was not.
Measurements are a good starting point but I believe a poor ending point. Yes, I do prefer the sound I search for via various components, cables, power cords, and sources. It may or may not be neutral, authenticly-live, etc. but it is what I like. I believe the good doctor and the good lawyer were talking past each other, their points were not so much mistaken or even misspoken as not heard.
The Drs. view that audiophiles may prefer a less than measured neutral actual live sound may indeed be true.
The lawyers that lowered power amps tend to sound clearer etc. is probably also true. It is his ears after all. OUrs may listen differently.
Getting all hot because the specs and measurements are so cool is a good starting point but a poor buying one. Once again Trust your Ears. And perhaps agree to disagree when necessary