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So lets say you put an Imperial Star Destroyer vs a Pillar of Autumn Class Cruiser (Its a newer ship modeled after the Pillar of Autumn of legend). So when a MAC gun gets fired at a star destroyer, the only thing stopping it is the armor, which is also hardened for blaster protection more than ballistics. By some stroke of madness no one in star wars considers ballistic or projectile weapons to be a threat anymore, which has led to a lack of protection from them as a result. Also, they lack one very important thing: Kinetic Energy shields. They only are equipped with turbo laser and regular blasters. Their weapons are made to be used against smaller craft, such as the Tantive IV, not ships of similar size and armor capacity.
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Its the fundamental flaw of the empire that they build stuff to intimidate, but they don't build for efficiency. Star destroyers do not actually have any such weapon. UNSC Ships have something that most star wars ships in general, but the empire in particular, don't.
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