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I don't know about this suggestion as a general rule, but I often find that I need to cover dark paint with something much lighter before going on to make a change in value for the final brush strokes. I also find that colors have a way of showing through subsequent coats. Recently I used burnt sienna to lay down some of the background for a child's hair which had pretty red highlights, and now I'm struggling to give it the basically brown tones that the references show. Especially in photos the red seems to take over.
I also recall seeing artists discuss the use of contrasting underpaintings to give landscapes the punch they desire. In illustrated demos it does seem to make a significant difference.
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