There's another simple numbers factor that strongly influences things.
In 1965 the population of the planet was around 3,000M. It's now over 8,000M so nearly three times as many potential listeners.

Jazz relative beginner, starting at a much older age than was helpful.
AVL:MXE Linux; Windows 11
BIAB2025 Audiophile, a bunch of other software.
Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts
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