I know, I know -- volleys fired. That being said, as far as a snapshot of progressive jazz history, while BN did release a handful of excellent and well-rehearsed dates by established artists, those smaller imprints captured a vital and raw slice of the time period that nobody else quite did. BYG and America also covered both the expatriates (from a variety of locales) and Parisian locals in a fascinating way. ESP's documentation of the NY scene of the mid/late 60s is unparalleled (and they also released choice artifacts from a number of Europeans).
And I'll echo Silva's assertion that Rudy didn't understand how to record Cecil's band. Those LPs are superb, but I'd sure like to hear them rendered in a more detailed way.
Finally, I've said it before elsewhere, but there's a part of me that wishes there was more from the Shepp/Mobley collaboration that appeared across Poem for Malcolm & Yasmina, a Black Woman. Imagine a full LP with Burrell or Benedetti, Favors, and PJJ!