Kingcrimson if you want to continue this don't think of springs as providing up and down movement . Think of them transfering up and down motion to back and forth motion as the shackle does at the end of the spring.The sliding mechanism in the hardware allows the board to contort without rider interference good or bad, depending on the circumstance. This is going to be a big issue in riders preference when it comes to decide how much isolation you really desire from you plate set up, introduce a soft flex or stiff flex in the plate and you can see the differences multiply.The pivot point of the plate is only there to prevent failure through fatigue of the fasteners, the sliding mechanism must have an element of pivot as well. Once you ride one these features, isolation and decoupling are very noticeable. But different.