Exactly zero. Apart from the beginning when H.C-B was a clumsy amateur he made no photographs at all, only exposures. But he screamed, and raved, and threatened, and bullied his darkroom staff without limit or pity until the final pictures supported his own idea of his own legend. And yes, there is grand art in that too; just not the art people imagine. There is nothing in the rules that says a great artist has to be a good man.
That's my point Maris - I am sure that if he could HCB would have had someone else press the damn shutter if he could. I am also pretty sure he would have embraced digital if it was available when he cared about photography.