I'm of two minds about this. Could the Death Star have frakked Scareth, if the Rebellion hadn't buggered it's planetary shields? If current planetary Shields, or maybe the next generation of planetary Shields can make a planet Death Star Proof, that makes the power of the Death Star impotent and moot, for any world rich enough to buy new/good Deathstar Proof planetary Shields. For the cost of building one Death Star, the Emperor can then sell 20,000 planetary shields. Which would more than balance the imperial budget. Sheev is a skeevy old geezer.