Angulation is an interesting thing. It does not always mean a sideways bend at the hip. Knee angulation for instance does not mean that the leg would be bending sideways at the knee. This is the reason that "counter" in combination with a braking at the waist is also called angulation. But it is not sideways bending at the hip. So it looks like the skier is angulating more after apex when he in fact is countering. Right?
So, why do we incline at the top of the turn? We need to create edge angles in order to turn. And we need to lower our CoM and project our body inside the turn to resist turn forces as they kick in. Its a living on the edge thing. As we project ourselves inside the turn we literally fall because there are not enough turn forses built up jet.
Is there a question coming or are you trolling?!?