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

Shadorne , I'm sure you already know, specifications shouldn't be used as an indicator on what sounds good. and you also know there is gear that have terrible measurements but sound spectacular. Plus you right, you can't measure musicality but you just know its there when you hear it.

@sean_heis1

If you find outstanding (better than anything else on the market or ever mass produced) measured performance to be a meaningless achievement then how do you propose to measure what you find important?

My ears and brain work together and outside of their limitations, I don't care because it's beyond my hearing and comprehension. 

I think the idea that advancements have slowed to a crawl is right. One area of improvement is the bringing of better designs to lower price points. To the masses, if you will. And then of course, the "B" and "C" tier can be had for even less these days.

But after reading this tedious thread, another thing comes to mind. It doesn’t matter what the subject is, folks will push their agendas ad nauseam. Class D, class T, pro amps, etc., I guess the future’s so bright for them I gotta wear shades.

This reminds of of the fervour with with some people will push their new favourite brand, like they just discovered the world’s first speaker. It’s another pet peeve of mine on these forums, the cult-like fanboyism with which certain internet brands get pushed, like fanatics at the airport. No thanks, dude, I gave at the office, okay?!

@roger_paul 

I read what you wrote 3 times and I still have no idea what you're talking about. No band in the EM spectrum requires air or any other medium to travel. We can send vibration (kinetic energy) through all kinds of mediums. That's how sonic welders work. The speed of sound through a speaker diaphragm is a very important characteristic of the diaphragm. 
I'm not sure what you're talking about as "speed" in a wave. EM flows through conductors pretty damn fast; a significant fraction of the speed of light. The information that gives rise to spacial cues has nothing to do with the fundamental of any tone. It's entirely the product of harmonics and phase. 

My answer is "yes".  But I approach it with three factors in mind: 1) is it organically musical; 2) is it transparent, and 3) is it reliable.  I believe we essentially are there with at least some gear..