Well, the AF plate certainly isolated me from stuff I was hitting this included tearing through late afternoon western crud/chop. It let me go faster in better control, with less shock and fatigue to my legs. I could jump on the nose or ride laid back and surfy. Definitely an improvement over riding the deck naked (2014 185cm NSR). OTOH I didn't get the sense of disconnectedness from the board, or the requirement to ride the board differently that you guys seem to talk about. Honestly the ride was so much better with it that I haven't taken it off since it went on.
Given that the front end of an AF plate mechanism is a slider and the rear is fixed, I'm not totally clear how this doesn't provide the same "style" of isolation as an axle system. My understanding is that the AF plate "hinge" effectively only rotates in one direction, therefore rider inputs to the board are direct, while board inputs to the rider are damped or isolated. This is also my experience from riding it.
All this being said I haven't ridden a low-resistance axle-based isolating plate such as you describe. Anyways back to learning to skate bowls.
Dave