I agree higher DIN can be needed in heavy pow, but I would caution against going to far to fix that problem. I had a "double tip dive" last winter that resulted in dual release and a head-first freefall twenty feet down a steep slope, ending in a head-first lawndart into the heavy pow. I remember being buried up to my waist from the wrong direction.
I hurt my back in that fall, but higher binding settings would have just transferred the injury to my legs. My skis dove down hard -- they were going to stop, and no binding would have helped. It was a question of my whole body falling, or just my upper body. I'm glad my ligaments made it to fight another day -- my back healed after a week or two.
Which brings me to my original point ... skiing can be dangerous. Setting your own DIN lets you pick which demon is most likely to injure you. You may still get hurt, but knowing where you ski and what might hurt you most, you can choose to make your injuries less serious.
