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I am not trying to posit that I know what an advanced alien civilization looks like. I don't believe I could possibly know their behaviour, morphology, communication methods, etc. That is the whole point. Your quote does not contradict what I am trying to say. By "stages" and "advancement" I am referring to complexity of system organization and energy extraction. The reason why this is plausible to discuss is because we do know the niche that hypothetical multi star-system civilization would inhabit (unless they leave or exploit areas of space we are currently unaware of - which of course is possible).