I think we forget that at the higher end, we are listening to how a particular individual or small group voice their speakers. If this voicing aligns with our own take on how music should sound, then we are attracted to that designer. If a designer has listened to many different cone materials and to their ears paper cones are better, then I applaud their decision. If that approach matches what I believe/hear as what music should sound like, then I will buy their product over other designers who may like so called more modern materials. Performance measurements are part of the equation, but the final voicing by the designer dictates the final outcome.