I have just had a brief affair with my old love, oil painting. As much as I love color, it detracts from what I am saying with form so I am back to thinking in earth tones again. That doesn't mean that a little bit of color won't show up. I think it enhances the piece if kept in the background. You probably aren't even aware of it unless you look closely... as in this recent piece.
The other reason to leave oil paint behind is a concern for my health. It's like bad love...toxic.