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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It’s possible they created themselves in a causal or paracausal loop (I think that’s what it’s called) where one vex traveled back in time and either created or became the first vex.