@kairosman -- Uber expensive speakers maybe, and even upper mid-end speakers. Most of the electronics tapped out ages ago. It is just marketing now.
Vu has very specific ideas. His equipment is lovingly built and modified and has superb dynamics. I have had him get mad at me, perhaps not undeservedly, for pointing out shortcomings that my ears told me. They sound like horns, with a reduced but still there horn edge. To say things haven’t advanced is silly. I think simply of how capacitor technology has advanced.
People in business must make profit to be in business.
Marketing, advertising, and hype are part of the deal.
There is engineering and design progress, also.
Sorting out hype from genuine progress is the job of critics, both amateur and professional, and of the consumer, who must use her own ears to make the final determination as to whether things sound better.
That's kinda all there is to it.