quote:
I've noticed that the troops cannot actually TAKE the planet as long as there is any sort of enemy unit still surviving.
Not quite, at least not in my solo games. My standard practice is to bomb the planet with a heavily shield DN with napalms until the place is soften up enough for my troop ships to move in. I AVOID killing all the units because that will leave the buildings intact, and I never ran into a problem with that.