The bar is placed ahead of mid foot on purpose. The idea is that at the start of the 2nd pull (when bar passes knees), the lifter is more over the bar and in a better position to accelerate the bar and then explode. This makes the pull to be considerably more complex by requiring the bar to be manipulated horizontally, instead of just pulling in a straight line.
Rip has argued that regardless of how the pulling is done, the bar ends up in the same place at the power position. And thus, pulling with the bar forward and hips down is less efficient and difficult to learn as well as not offering any significant dvantages.
Part of the low hips thing is not just due to the bar being too forward, but from the lifter lowering their hips beyond what the bar position dictates. You'll see this when their hips shoot up off the floor.