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Heh, I'm imagining war to create a galactic empire, then in some way clever aliens, who were laying low the whole time, move in and take over the leadership.

Well, even the Galactic Empire had a limit on manpower and resources. If forces are directed to a particular planet that means resources must be diverted from somewhere else. It's not just military forces- everything from technicians, mechanics, etc. must be present because enslaved beings may...

I would imagine, since even now we can launch nukes from orbit and devastate a planet, is to hold captured positions on worlds we do not want to annihilate.