Fascinating, I’ve used a 50mm in, among other places, Bangkok (not 50mm, but normal FoV with crop sensor), Tokyo, New York City, and currently Chicago, but I guess “busy streets” are elusive in these parts. But true, a 50mm is “useless” when you need a longer or wider lens, just as a longer lens is useless if you need a normal or wider lens, and just as a wider lens is useless if you need a normal or longer lens. So?
True, Cartier-Bresson used 90mm and 35mm (and maybe some others), but he certainly found exceptional use of the 50mm as have other photographers. And folks, HCB did not die in 1939; he had access to lots and lots and lots and lots and lots and lots of different focal lengths before he called it quits.
And remember, Cartier-Bresson is expressing an opinion; his personal preference. A quote from a moment in his life that is allowed to fluctuate and change, and one that, given its lack of actual gravity in contrast to say, war, natural disaster, and mass starvation, is even allowed to be hypocritical or flat out fictitious.
Also, to return to this “modern” issue of frenetic or busy streets. F-that. Streets are actually tame and orderly these days; the plutocratic and corporate shaping of the structural landscape, the displacement of much of the middle class, the loss of ‘ma & pa’ stores, and the suburban exodus have in part emptied streets and kept people in line (almost literally). When it comes to dynamic public interaction, I’ve seen photos from 1960s Omaha that put modern-day Manhattan to shame.
I know, it’s crazy, it’s downright radical, but, but, but….use what you want, use what you like, use what you need. There’s lots of choice these days, and that’s a good thing.