You certainly must have very exotic tastes in Rock & Blues, anything there was any real demand for was released on CD. I currently have over 4000+ albums stored on my drives, I'd say about 70% of it classic rock stuff 90's and earlier. I don't much collect "greatest hits" unless it's something special, like the new Chicago IX Atmos bluray.
Much more has been done from designers paying greater attention in radiation patterns of both the individual drivers and from the speakers as a whole.. The speaker/room interface has gotten an lot more attention in the last few decades. Have you read Floyd Toole's stuff?
Are multi thousand dollar beryllium tweeters worth it? Yes very marginally IF you could afford them. I can't LOL
Speaker advancement has been incremental in all areas, but it has advanced.
Sure, the
High End has lost all touch with
High Fidelity. It's more about bragging rights on the cost of your
system than having something that's really more accurate to the source material. But I do see some light at the
end of that tunnel with more interest being shown to the web media covering our passion from a objective and
measurement based angle. Luxury goods are nice, but many watches keep as good if not better time than some
a small fraction of the cost. The same is true for audio.