Might benefit the casual snapshot photographer, but pros use flash more for fill-in lighting when there are sharp shadows and for freezing motion e.g. in sports photography.
There is an entire category of pros--documentary photographers--who love high ISOs and will love higher ISOs even more. By comparison, casual snapshot photographers are more likely to use on-camera flash in low light conditions. But that's just my personal observation.
Avoid making a commotion, just as you wouldn’t stir up the water before fishing. Don’t use a flash out of respect for the natural lighting, even when there isn’t any. If these rules aren’t followed, the photographer becomes unbearably obstrusive. - Henri Cartier-Bresson
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