Metaplots are already a bit shaky for something on the power scale of, say, D&D, but when you try to apply one to Exalted, a game where the expected PC is capable of single-handedly changing the entire setting with enough effort, it really doesn't work. A Solar Circle can straight up topple empires, uncover grand lost secrets, form their own empire, and go as far as fundamentally changing the foundation of existence. This is also why pre-made adventures don't work for Exalted--or at least, for Solars--because PC's can often just utterly smash through what would be narratively interesting roadblocks...