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

Microphones cannot 'hear' everything so those designers were right anyway - music can't even be recorded as performed let alone reproduced. And I think this is good. Let the chase continue forever.

inna,

" music can't even be recorded as performed let alone reproduced"

It turns out this is not true. You have formed an opinion about the current and past recordings based on what? An admittedly poor reproduction system? If you take the distortion out of the playback electronics you would be shocked at how much captured detail and imaging data is embedded in the recording including cues that trigger the sensation that it is live.

I mean it cannot be fully recorded, I did not say that it cannot be recorded well except big orchestra opera and big choral pieces - this is especially tough.
In any case, I believe that amps and wires without gain are already quite good, that is not a major problem. Turntable set-ups and open reel decks are quite good too. Problems are the recordings themselves and speakers. The beginning and the end, the middle is acceptable even if it may cost a fortune to be that.

Now days it seems anything gets copied or is a copy of something else.  

https://www.aliexpress.com/item/Big-Aluminum-Chassis-PASS-Class-A-Power-Amplifier-Enclosure-DIY-Case...

@roger_paul 
What if I could power my amp with fairy dust? Oh crap! This is reality and asking "what if..." doesn't make a thing possible. There isn't a 4th way to use them so now what? Just design irrational circuits that do nothing? You see these unlimited uses. Tell me what they are exactly. 
And who are you exactly to left handedly insult people as to the quality of what they've heard? I can't stand the kind of pompous arrogance some folks like you wield around here, preaching down to the unwashed masses as if you've beheld divinity and know better than all. 
I'd venture to guess that most of the folks here are listening a lot better than most of the world even knows is possible. I've hardly got the finest system money buys, but everyone I've dropped in the listening chair has never heard anything like it. You talk like if we could just build the perfect line stage and the perfect amp we'd here audio utopia. So... How's that perfect amp going to drive imperfect speakers? And how are those imperfect speakers going to interact with an imperfect room? We just need more active DSP? Answers, pal... Let's hear em. No more meaningless platitudes and condescending preaching.