i wouldnt say the bindings are "park" bindings but more freeride bindings that usually contain more metal than plastic, higher DIN and lower stack height to get the skier closer to the ski. Most of these are modeled after race bindings with the exception of the FKS/Pivot.
People like the pivot for the turntable of the rear heel and the small mounting location on the ski. The four rear screws are closer together and allow for more natural flex in the ski than that of a binding in the Royal family by marker or even the attack line from tyrolia. The turntable will twist to let the skier out in the hope of protecting their knees. They also have a 25mm elasticity in the heel leading to less situations of ejecting from the bindings than with a traditional front side binding.