System rationality means that one takes this back or that one denies the indifference of the system (the fact that whatever happens in the environment does not happen to us) and instead strengthens the irritability, sensitivity, or resonance (or whatever term may be used) of the system.
When discussing organizations, which Luhmann argues consist entirely of decision-based communication, one might ask about buildings, desks, chairs, telephones, computers, electricity, as well as human beings. Aren’t these things essential to most organizations? Shut off the electricity or the Internet access and most organizations stop functioning. Thus, a common criticism of social systems theory relates to materialism or material agency.
The distinction between being and nonbeing is now replaced as primary distinction, completely implausible from an ontological point of view, by the distinction between inside