Originally Posted by mack_turtle

I'm no roadie, but when I read this thread title, I thought about my experience with mountain biking. dropping your heels on bumpy, bouncy, momentum-killing is a great idea because it helps drive your body weight into the pedals as obstacles on the ground continually push back. If you're clipped in, this can save your calves a lot of strain. If you're riding flat pedals, it is essential to keeping your feet on the pedals and, therefore, your face out of the dirt.

On the road, I would think it would help lower your CoG. that's helpful in some situation. more importantly, it would save your calves from strain. there's probably a middle ground where it's useful in some situations, just like standing/ sitting, spinning mashing, and using different parts of your handlebar are the best depending on the situation.