Some of it for me, is in his switching. Now, I can hear it. Back in the day, his tones blended seamlessly, he went from warm round clean to high gain and you didn't notice the change until well after it happened. CK's lights were the same, his fades and blends were far superior back then to the button pressing switching now.
Analog days. They are gone, and while Trey (and CK) has way more in his arsenal now, it doesn't have that same wow factor. Less is more? Or maybe when you have limits to what you work with, creativity kicks in more. (Original Trilogy vs. Prequels).
Damn progress (0).