The aligning of the broadhead with the fletching probably got started with the traditional guys.They sometimes use the back edge of the broadhead as a sort of draw check. Just draw until the broadheat touches the bow hand finger and let it go.Byron Ferguson uses this technique. Obviously the back edge can't be sharp!

This is the only time that I have ever heard of a BH needing the blades to be oriented a certain way.

As passthrough pointed out, it is absolutely necessary that the BH be aligned with the axis of the shaft so that there is no wobble.