I keep a Eugene Smith quote on my darkroom wall, which I think is apropos to this discussion:
"Negatives are the notebooks, the jottings, the false starts, the whims, the poor drafts, and the good draft but never the complete version of the work... the print and a proper one is the only completed photograph, whether it is specifically shaded for reproduction, or for a museum wall. Negatives are private, as in my bedroom."
I keep this quote up to remind me to shoot first and ask questions later. It reminds me that I don't ever need to justify why I shoot anything to anyone. For me, Cartier-Bresson's negatives are nothing to judge him by. Seeing them makes a legend seem more mortal perhaps, but in the end he should be judged by his finished work, which I think the World agrees is the gold standard in photojournalism.
It is certainly instructive however, to see which image a photographer chooses to print among a series. Interesting, but as Smith states, not the work itself. Just because we snap the shutter doesn't mean we made a photograph worthy of working into a print for publishing or hanging in a gallery.
I also feel that photography has a characteristic to the process which is very different from painting, drawing, or even sculpture - many of the other visual arts are created through a building process - the artist has an idea, and then brings material together in an additive way to represent the idea. Layers of paint, coils of clay, objects in an installation etc. In the Art of photography, we reduce. We take everything and boil it down to one thing. We consider every possible place in the World, every possible event or person, and then choose from all the angles, lenses, filters, effects, films, developers etc - and we get to one, single choice - a pure reduction of everything. To perfect that reduction and get an image that is the way we saw it takes a lot of shooting, because unless we are in a studio (yuck) we aren't ever in full control of the elements we have to work with. So I don't know why we're suprised Cartier-Bresson occasionally bracketed. He also shot masterpieces while not even looking through the camera, and he laughingly admitted it. But one thing is for sure, it took his eye to realize that he had a materpiece on his hands when he saw the contacts.