I may have phrased things poorly. I was not referring Zone System experts, but to fine art photographers. Sorry if I confused things.
I have to agree, a lot of technical "experts" failed to see the forest for the trees.
Callahan knew nothing about the Zone System as I recall, but I am shocked to learn he knew nothing of Stieglitz. However, since the art elite have taken over fine art photography a lot of the prior history has been put off to one side. They like to teach history their way.