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Void Synthesizers have a couple of key flaws.  They can't produce goods, which are critical for elevating colonies from [content] to [prosperous].  They're also extremely endgame, and cannot be used to push planets from [prosperous] to [rich].  

On the other hand, Starbirth can be used to push planets from [prosperous] to [rich].  


Similarly, infraspace can also be used to move the necessary extra resources to propel planets from [prosperous] to [rich].