I agree that practically every device on the market can benefit from mods. Empirical Audio modded 40 different components for about 10 years. Very lucrative business and lots of happy customers. However, I got to the point that I could not get the ultimate performance from other companies products with mods in them. I had to design my own components. My customers begged me to do this.
I still mod components, but only my own. Every component I make has gone through at least 3 improvements, most of them inexpensive upgrades. It's a vestige from many years at Intel, where continuous improvement is part of the culture.
I also agree that 2- dimensional sound is pervasive, and even sound that resides only between the speakers. It requires some expenditure to achieve wide and deep soundstage and 3-dimensionality. It also requires every single thing in the system to be optimized. Even one poor cable can screw the pooch.
Steve N.
Empirical Audio