Originally Posted by markbarendt
Extra exposure increases graininess, try it some time. You can end up with a thin image (read: thin image) where minimum image density is close to max.
Better shadows does not equal more saturation. You are compromising saturation above mid tones, and the tones above mid tones get compressed.
The colour separation gets smaller and smaller on the negative the more above mid tones you go.
Try shooting a sunset some time, and expose the sunset colours as mid tones, then expose for the shadows on the foreground and see where you get.