There are several very interesting threads of reasoning that distinguish presbyterian from hierarchical governmental systems.
The one piece i am interested in is the problem of peers.
Simply put, the congregational system lacks accountability and systematic peer review because no one is the peer to the pastor-teacher. For he is the only one paid to work in the church. The fulltime, paid, educated in theology makes him vulnerable to wandering because he is not in contact with peers.
In the presbyterian system the pastor-teacher actually belongs to prebytery as his church body. This allows/requires an interaction on a regular basis with people just like him-paid, seminary educated, teachers, preachers etc ....
Don't underestimate the value of this, just a moment comparision with institutional science will yield that this insight drives study, discipline, etc.
by contrast in a hierarchical system the levels themselves will begin to divide information from responsibility, as is seen in economic institutions. or better yet in military with fine graduations of ranking.
neat stuff.