Difference between a soft plate and stiff plate is much like the difference between a plate and no plate. While a stiff plate gives a more resistive stance a soft plate allows you to stand a little more relaxed but with the same control as stiff. Plates are going to change the way boards are made. I can see it comming down to a combination of board design , plate design and hardware interface, hinge,slide whatever. It would be nice if we could agree to some standard for mounting hardware ie; insert pattern so all can participate and interchange components as we can with binding.