Holding sprint should not matter at all. Players never move or turn like that period. It doesnt matter if they are sprinting or not. A person still needs to turn around, there was not turning around or planting. It should obviously be more prevalent when sprinting, but there should be momentum regardless.
Locomotion for Madden has been straight wack. I wish it hasnt been, I really do. But it has been. That video shows that it will continue. So they changed the game from the outside first. Like doing plastic surgery before fixing broken bones. Everything in gameplay has to do with how the players move. Once thats right, then move on to all the nice nuances.