If whole scenes are started to be wired up using bindings, it will be very difficult to trace the flow of data and thus to debug. I've got some decent experience with JGoodies binding and that can already be a problem. JavaFX is set to become binding to the power, so I can only imagine what will happen in complex scenes. With JGoodies I often introduce a man-in-the-middle to be able to trace the flow of data, maybe it would be good if it is possible to add a listener or something to a binding in order to debug.