Not sure if this is mainly a NZ thing, but I can always spot a skier from NZ by the squaring up of the feet during the turn. If you're confused, what I mean is the outside ski is not lagging miles behind the inside ski, which sort of happens naturally as the inside ski follows a shorter radius. So.... the benefits of this are
1. Squarer hips and stronger stance on ski
2. By bringing the outside ski forward so the ski tips are not so far apart creates more turning force.