People were simply making do with the equipment they could afford at the time and sometimes a limited technical skill set which pro labs went through hell to iron out. I've seen quite a bit of early work by some of the above, and the ratio of bellyflops to "remembered images" was staggeringly high. Given the combination of a "starving artist" and the high cost of 8x10 color film and printing even back then, more precise technique would have been a distinct advantage. Some improved, some didn't. Certain big names of the 70's are mothballed now. That canon of photography you talk about can be rather brittle.
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