Originally posted by Jonathan Mac Not at all, because these are for an SLR and can therefore be swapped for other focal lengths. A fixed-lens camera needs the most useful focal length possible, and that won't be 28mm for the majority as in the broad scheme of things it's quite extreme. Do so many people want to shoot exclusively at wide angle???
I think you are theorising without any user group that fits your description. Many people won't shoot any fixed lens camera at all, as zoom lenses are now mostly produced and accepted as de facto standard.
Now, out of these who really want to have a fixed lens option, they are more experienced — no doubt about that. They know the tradeoffs and are willing to live with them.
There you have basically two schools: one is European/Western and one is more traditional Japanese. When you give them 35mm and 28mm fixed lens cameras, the former likes the 35mm focal length and the latter likes the 28mm.
However, both give you a great solution to photograph (a) landscape, (b) very expressive portraits, (c) combination of both — interdependency of people and their environment.
A 50mm fixed lens hardly does best in landscape department, and for 50mm often more
defensive approaches in photography are required:
(1) stepping back from the subject
(2) constantly keeping away / keeping distance from the subject
(3) waiting for a subject to "aesthetically fit" the frame.
Both 1, 2, and 3 nicely describe a "classic" approach to street photography, in the manner of Henri Cartier Bresson for example.
28mm and 35mm, however, allow for more
spontaneous, engaging and stepping forward approach to taking photographs. It's more modern and relaxed, framing not so important, composition is freer, proper focus isn't important either, which is visible in works of the new wave of street photographers, like Winogrand, Meyerowitz, then more contemporary like Moriyama, etc.
Although I can see the possible potential for 35mm and maybe 40mm fixed lens camera in GR style, that latter probably won't happen anytime soon. But as a lens in some new system camera, well, yes, I can see it there.