Wide-angle lenses allow you to capture more of your subject in one shot.
Even though the point-and-shoot digital cameras that can accommodate wide-angle lenses are smaller than traditional SLR cameras, they are a bit bulky when you add the wide-angle lens attachment.
Longer focal lengths compress information, while wide-angle lenses can create a richly layered sense of depth.
Some fear wide-angle lenses because they seem to distort the subject in this manner, but I see no problem with such distortion-most viewers simply recognize it as a perceptual effect.
Since digital SLRs can rely on miniature electronic LCD viewfinders, perhaps the difficult problems of designing retro-focus wide-angle lenses
that clear the mirror swing of SLR film cameras won't have to be overcome, and the nearly nonexistent selection of digital extreme wide-angle lenses
are good for this purpose, because their greater angle of view and depth of field bring more of the surroundings into the frame.