More important, billions of Vex and yet they only attack us a handfull at a time..... really? Why not send wave after wave while we were in the Vault of glass and overwhelm us? I stopped trying to make sense out of all of this ages ago and just enjoy the game.
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maybe vex collective went with a jaguar cpu for the minds assigned to each area and so they can only handle 30 or so vex at once?
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Maybe even psychotic killer robots have an ego?