Further weapon variety

However, given the surface-to-vacuum defenses, the number of fighters, turbolaser batteries, charged-particle blasters, magnetic railguns, proton torpedo banks, ion cannons, and a host of other protective devices, no naval ship of any size would be even a remote threat. A fleet of Imperial-class Star Destroyers-even a fleet of Super-class Star Destroyers, should such a thing ever exist-would offer no real danger to the battle station once it was fully operational. Given all that, a shield system that was less than perfect at times wasn't such a high price to pay for the ability to vaporize a planet.

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Star Wars: Death Star Part 1 Chapter 2