Even with the PDS system, damping is still velocity sensitive yet with a positional influence. Think about it. If you remove the spring from the shock and raise the rear wheel slowly you will feel little change as you go through the stroke. move it quickly and you may then feel the influence of the needle and the second piston. Hypothetically of course. I understand what you say about the spring force, although variable, at a given point it becomes a constant. But the same can be said for a linear spring. The energy stored in a spring under compression is accumulative and the opposite could be said for its extension. Wether progressive or linear the force is under constant change. The difference with a linkage is that we have leverage creating the progression which once again at a given point is a constant and therefore position sensitive. KTM are trying to manipulate the damping through needle influence at given points. This influence is not always wanted or required. Hence the reason we are still discussing the capabilities of the PDS system.