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

Wouldn't a perfect amplifier also have infinite input impedance and zero output impedance?

kosst

Sure it is! You can't run a linear power supply or a class A or AB amp in a box with no heatsinks or ventilation. The weight and appearance rule out linear circuits.

Wow you can tell all that just by looking at it?
Very impressive.
But wrong.

Is this "opposite day" or something?

@roger_paul 
I can! In fact, I can say almost anything I want because you can't prove me wrong. Without cooling though, there's absolute certainty what your output stage isn't. 

kosst

Without cooling though, there's absolute certainty what your output stage isn't.

Your absolute certainty is absolutely wrong.
First you're criticizing my amp without hearing it and now you're telling me I have no heat sinks with seeing it. I don't think you are going to get away with that one. Its too easy to prove. (They are on the back)
It idles at 30 wpc.

Are you a remote viewer?

@roger_paul 
"It idles at 30 wpc."
I seriously doubt it. There's no way you have a passive sink on the rear capable of dissipating the kind of heat an output stage idling at that power level would throw off. And you haven't really proved there's one back there anyways.