@Horton. In a vacuum, the heel side/toe side thing makes no difference. What does make a difference, I think, is that by rotating my front foot toes to the right (opposite of what most LFF people who rotate a front foot would do), when I flex my front knee forward, it flexes directly over the center of my ski. If my front foot is straight, my knee flexes well toward the left edge of the ski. If my front foot is rotated toes to the left, my knee flexes off the left side of the ski.
Assuming you agree that the back foot primarily controls the on side turn and the front foot the off side, and further assuming you don’t advocate skiing with locked knees, if your front knee flexes to the high side edge in the off side turn turn, the knee pressure is working to diminish the roll of the ski. If the knee flexes over the center of the ski, its pressure is neutral on both the on and off side and thus does not interfere with roll on either side.
Getting the front knee to flex over the center of the ski is the benefit, as I see it. The consequence for me is a true heel side/toe side, which by itself probably makes no difference at all.
Jenn LaPoint encouraged me to straighten out my front foot for years. It’s easy for me to try, so I have. I tried it for four months and I lost a full pass. My current coach says that he likes how my ski is set up. I’ll ask him about the rotation thing and report back. Could be a little while though as I seem to have injured my knee. Hopefully, not badly.