I'm 4 pints down at the pub right now so didn't read all of the above, just the first and last paragraphs, so treat this reply with the contempt it deserves.
I think it's important for us to know which frequencies we like accentuated and attenuated in our personal "sound". If the amplifier allows this, and we can work out which knob does what then that's perfect. In my personal experience it has taken a long time to figure it out, but now I have I can get my sound from just about any decent amp system.
The analysis and science bit is irrelevant for me, hic!