It’s the same reason that modern recordings and LPs sound like Crap, specially when compared to the Golden Age recordings. Those engineers are gone and the knowledge they had along wry them. The same situation with speakers from the Golden Age era, the know how just isn’t there.Yes, your article on Leifs system was a great read and an interesting data point. But it supports my points. I would love to know the clear reasons, I see only very small group preference in those arguments. Interesting, but not an explanation.
Survival arguments would please Charles Darwin fans and sound great, but statistically are not valid in this hobby. And sorry, IMHO implementation is the keyword in audio, materials are second place.
You’re wrong about materials, it’s extremely important, implementation is a different part of the equation not less or more important. A good example is the modern heavy vinyl formulation, it’s horrible and dead sounding no matter the implementation! Vinyl chemistry is another lost art! Bar a few thIngs and brands we can go through the gamut of highend with similar comparisons.