Many mogul skiers talk about being tall before coming into a bump, because you need full range of motion to absorb. High edge angles aren't the focus, but instead absorption and extension is the focus. For quick turns on big bumps at high speeds, if you stay crouched the whole time, you're dead. Racers are extended at the apex, at least for the outside leg, and often crouched through transition. The same is true for mogul skiers. It's just that without high edge angles, both legs are extended. The turn is vertical, because of 3D snow instead of horizontal. High edge angles end up happening on the backside of the bump, because of the surface contour, not because of body angulation or inclination relative to gravity. It's a fact that for many people, if they don't focus on getting tall then they will defensively crouch and not have enough range of motion to absorb the bump.