Are future improvements in Amp/PreAmps slowing to a crawl?

Was the ouput level matched to within 0.2 dB?

I can hear a tube from way down the hall. So can the guy under the bridge. No mystery there. 🕵🏻

Mr. Paul.  I have an ancient Sony strd1011s in the closet that kind of does what you suggest a perfect amp does.  There's a bunch of goofy low-fi surround/reverb effects that allows one to approximate what different seating positions and distances in various venues would sound like.  That thing is cool to play around with, but it is far from perfect.

I might agree that a "perfect" amp would sound like no amp, but I completely disagree that a "perfect" amp would allow a volume knob to function as a zoom for proximity.  That wouldn't be "perfect" to me, except perhaps from a point source in a true anechoic chamber.  Cues for distance include much more than just volume.  If the amp included those cues, it would no longer sound like "no amplifier." 

@roger_paul 
If you're going to come here and tell me you've built the perfect amp I'm going to call you a liar. You have not. I've asked for a concise definition of it's operating theory and measurements and you've talked in circles. 
Your understanding of a volume knob's function doesn't even make sense. If a flute is miked 15 feet away and recorded, the reproduction system should present that flute 15 feet behind the speaker. If you turn the volume to a whisper it stays at 15 feet. It crank the volume to 11, it gets louder, but stays at 15 feet. This truth is obvious to anyone who's heard a decent stereo. The spacial distance information is in the recording. Adjusting volume is nothing like moving around an auditorium. If you go wandering around a venue you're not just hearing the reduced magnitude of the sound. You're hearing the acoustic character of the room and space between you and the instrument at the various points in the room. Your explanation makes no sense. 

You know, way back on September 12, Roger offered to send one of his pre amps to Kosst to audition under no obligation to buy. He flatly turned him down. Then he has spent the next month berating him and proclaiming that there is no way his product can do what he claims. Just listen to the damn thing and form an opinion after that. Quit f***ing speculating about what it can and can't do. What do you have to lose? It takes a special kind of a**hole to act that way.