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In my career in the audio industry most of the greatest
recent advances have indeed come from the lunatic fringe.

No, they were ported in from other industries.

There hasn't been any serious R&D in this field for over
two generations.

Agreed.

Most people don't realize that sound reproduction was the
equivalent of the "space race" during the 1920's and
30's. Most every topology, circuit, and interconnection
methodology can be directly traced back to the work of
Bell Labs and their competitors, much of it for military
applications.

True for analog and tubes, but not true for SS and digital.