This is Principle I of the Ecological Psychology of Richardson, et al. 2008. I guess the main thing one might take exception to here is the idea that O-C systems are the proper units of analysis. It's one them to propose them as proper units of analysis, but the (only?) proper units?
Richardson, M., Shockley, K., Fajen, B., Riley, M., & Turvey, M. (2008). Ecological psychology: Six principles for an embodied-embedded approach to behavior. Elsevier hand book of new directions in cognitive science. New York: Elsevier.