Greyhawk, Birthright, The Balance and the Old Faith

When searching the blogosphere on what makes the World of Greyhawk unique as a setting, sometimes the answer "militant neutrality" is given. See this thread and here as examples. In the EN World thread, this passage in particular summarizes it best:

Greyhawk is not concerned with the triumph of good over evil. The very nature of the evils loose on Oerth makes such triumphs fleeting at best. Greyhawk endures evil and circumvents it. It does not defeat it.

And:

Perhaps accounting for all of this, Oerth has strong and active neutrally aligned forces, working to preserve a balance between good and evil. While hardly organized, these forces nonetheless manage to be quite effective. The Circle of Eight, mighty wizards all, seeks a middle path. Istus, the divine Lady of Fate, tests all but favors none. Druids are a quiet but ever present presence. Indeed, many of Greyhawk's deities reflect a distinct neutral bent.

In Gygax's Gord novels, the hero is heralded as Champion of Neutrality. And other protagonists are all of a distinctively neutral bent. What is more, Mordenkainen, Gygax' original Player Character, is an active proponent of the Balance and leader of the Circle of Eight. The demigod Zagyg, Gygax' author avatar in the infamous Castle Greyhawk, is Chaotic Neutral and serves Boccob, the god of magic and non-interventionism.

Erik Mona, in Living Greyhawk #0, describes Mordenkainen's militant neutrality as follows:

Mordenkainen's view of "enforced neutrality" is not a tit-for-tat equality but rather a detailed theoretical philosophy derived from decades of arcane research. He has fought ardently for the forces of Good, most recently during the Greyhawk Wars, but just as often has worked on darker plots to achieve his ends.

Ever since reading that quote, I wondered what this theoretical philosophy composed of arcane research would be. As I am preparing to shift my campaign over to Oerth after completing my current campaign in the Sunset Realm, my attention was drawn to this conundrum.

I have concluded that, in *my* Greyhawk, the Balance propagated by both Beory and Boccob is one and the same: a balance of nature and natural forces, neither good nor evil, necessary for the flow of lifeforce and arcane magic. Mordenkainen's arcane research delved into ley lines, arcane energy and the necessity for not one civilizing power to gain dominance, for the development of civilization on a grand scale would limit the flow of arcane energy. The druids of the Old Lore agree with this basic insight, but disapprove of the sole focus on arcane magic, rather taking the perspective that all natural life must flow unopposed by civilization.

What do you think is at the foundation of Mordenkainen's philosophy? And why do the Druidic Hierophants disagree with him? I would love to read your views in the comments!