Oedipus, you make a lot of sense 
I agree with all you have said except maybe the harmonics being non-linear. As with the parametric EQ.. if you knew what harmonics were added, could you not apply an inverse of those harmonics to the signal to remove them?
I'm not sure what we are arguing about now.. I just didn't like BD saying the Rotel IS better because it is more accurate the then Sim. He has now said an accurate amp doesn't always sound better. I'm happy 
It is an interesting discussion though!