Do vex always exist? If they are part robot, part organic, and utilize the same shared space then they must. For the most part we think the only thing they want is ones and zeros, but they can't survive without the organic radiolaria...so they can't be solely 1-0, they must be organic.
It's just something to think about, question the logic of this game.
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All I know about the Vex is that we could be in one of their many simulations right now and we wouldn’t even know it.