It is able to show and analyse systemic relationships between findings of different scientific disciplines.This is achieved by tying them together in an abstract network.
Systems theory dispenses to a large degree with causal relationships, whereas the usual attempts at integration try to relate in a consistent way different scientific findings to a few grand basic hypotheses.
The sciences concerned with the state have been differentiated and specialized.
Public law, economics, political science, political sociology, geography, planning, and other academic disciplines have developed their own systems of reference for theory and analysis.
Obviously, this selective dealing with scientific data by political office-holders can never be and should never be quite eliminated.
But the complementarity of the different sciences and their overlapping has become so evident that something along the lines of the old integrated theory of government is desirable.