Let's consider Things as butterfly nets that hold living butterflies. Hold them too hard or too long and they die--we call that reification. The thingness is not the butterflies-flying-living, rather it is the net, almost invisible. Yet the net (netting as a cognitive activity, a Concept-making activity) the thing that allows the butterflies to be held apart from their environment--a pre-death kind of isolation.
Thinging is netting interactions and naming them. Kind of temporarily killing them--considering Dynamic systems to be Static. This can be OK if it is a matter of scale where the aggregate of all the movements is all that is relevant. But one has to be terribly careful to not use averages where the individuals matter. We sometimes kill (make static "systems" of dynamic systems) them within a culture or paradigm.
Perhaps we need to continually emphasize among ourselves that all systems are Dynamic. Even an electronic system is not really a system until it has electrons moving through it. Prior to that it is a latent system, waiting for electrons of the right force and rate and direction.