As an anarchist systems thinker I have to say I don't appreciate how they clearly and emphatically imply that social systems are necessarily hierarchical. They draw a false dichotomy between community and systems. Systems are not diametrically opposed to communities. Systems are just repeating and interrelated behavior patterns plus the other resources that support those behavior patterns. Communities have systems, sometimes named, sometimes unrealized, sometimes designed, sometimes appreciated, and sometimes dysfunctional. Systems are a way to match complicated dynamics with declarative semantics so it can be acknowledged and manipulated, instantiated, moderated, or ended. Hierarchical organizations are just one type of a huge range of human systems.