Maybe its paradoxical. Me thinks that duality is simply the proponent of the world, not something made up by Egyptians, or any other philosophy, or invented, but a recognition of the nature of reality, it's the fabric of everything, and it provides contrast to all. Much like awareness is the background and contrasts change, so is duality a propriety of the world/manifest, it allows us to contrast things. The metaphysical is nonsense, non-experience non verifiable ad nauseam assertions and suppositions, conjectures and hypotheses without methods, of no practical appliance or value for building models upon.