Fallen - Wormhole, Light speed capabilities.
Vex - Chronal, Time Travel capabilities
Hive - Multiversal, Universe Travelling capabilities
Vex CAN create throneworlds, they just need to travel to a time where it's possible (see Books of Sorrow and Atheon)
Basically this is just Bungie half assedly explaining why we constantly fight Atheon, or Crota, etc.
The Calus Bot was another really lazy example of it.
English
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But time cannot come from nothing because it never existed. Unlike matter, which cannot be naturally be created nor destroyed by our physical laws, or energy, which is similar yet is always lost to entropy by our laws, time is merely an axis by which we measure change. If the Hive can manipulate space and time to create throne worlds, and the Vex can do the same, why then do the Vex stuggle? I thought they were limited to travel between points in time across an overlapping axis. Like a pile of graph paper or something.
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Atheon, Calus, and Aksis(kinda) make sense as to why we keep fighting them. Oryx and Crota make no sense.
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"It's in the script" is always the easy answer. But it's also why we ask need ask all the questions.