The problem with the metaphor is that the Jedi Order has it's origins in people of a variety of species and their respective religions and philosophy were brought together specifically to study the core truth of all those religions and philosophies... the Force. What they know for certain, and since this is now established on a higher plane as true and potentially handed down from higher, discorporeal, beings to mortals... the Force has, objectively, a light side and a dark side. Both have certain qualities, and those qualities cause certain reactions in the beings that can sense them and work with them. So that basic knowledge is objectively true, and thus the base Jedi metaphysics of the Force is objectively true. Terming it "the Force" is actually a kind of a recognition that they don't really know what it is. It's kind of like Tao, which is a very sort of general name that is inherently suggestive that it cannot be truly known... and indeed Tao Teh Ching says that is explicitly why it is being called "Tao." Or, for instance, YHWH. What I'm saying is that the Jedi Order started by mystics, clerics, philosophers, shamans, martial artists etc being brought together and saying "we know there's this thing underlying all existence, let's call it the Force, and here's what we know definitively about it." They can't really say much more than that. They just know the implications there of. It also doesn't mean the Aing-Tii are incorrect in saying the Force is a spectrum.... they are identifying different parts of the Light in doing so. The problems arise when you have a group like the Potentium that says there is no dark side, period. That becomes a problem.