I don't think it's fair to equate colors in natural scenes with the space of colors you find with diffuse reflection. There are tons of things (fireworks, light

I don't think it's fair to equate colors in natural scenes with the space of colors you find with diffuse reflection. There are tons of things (fireworks, light shows, the sky, your 1337 RGB LED setup, fluorescent art, etc.) people may want to take photos of that include emission, scattering, specular reflection, etc. In practice that larger space of things you could perceive "in theory" is full of everyday phenomena, and very brilliant colors and HDR scenes (e.g. fireworks against a dark sky) tend to be something people particularly enjoy looking at/taking pictures of.