I really think this is over exaggerated compared to much simpler dynamics such as the experience of the listeners and, which cuts to the core here, how many are actually using the 007's correctly? The SR-Omega and SR-009 are plug and play but the 007 sure as hell isn't. Something as simple as how the earpads are mounted is crucial and I've seen stock sets from the factory with them incorrectly seated. Add to that the earpad condition, rotational position plus the angle and pressure of the arc... there are a lot of variables.
I have a hard time believing that anybody find the artificial upper midrange of the 009 accurate. But hey some people think the HE90's are accurate and neutral so there is some really stupid shit out there.
One more thing, blaming our amps for Stax being bright is utterly idiotic and ass backwards. The 006t, 007t and 727 roll off the top end a lot plus inject a lot of distortion in the upper registers.