MarkB
Legend
With multiple Death Stars patrolling an Empire, blockades and interdiction technology might become more important. A Death Star is almost too big to enter hyperspace as it is - its own mass creates a gravity well nearly sufficient to interfere with hyperspace jumps. That should make them exceptionally sensitive to the gravity-well-projectors of Interdictor starships, maybe even to the point where being knocked out of hyperspace would do them serious damage.
Capturing and reverse-engineering Imperial interdiction technology would be a high priority for independence-minded factions. A Death Star might be tempted out to quell an uprising on an Outer Rim trade route only for its return coreward to be blocked by interdiction blockades, starving it of essential supply convoys.
Which brings up another point: Running costs. I seem to recall reading that even a single Death Star tended to eat up resource, personnel and maintenance budgets comparable to half a space fleet. Having more than a couple of them on active duty might simply be untenable on purely economic grounds, the hulking space stations acting as massive resource-sinks straining even galactic-scale military budgets.
Capturing and reverse-engineering Imperial interdiction technology would be a high priority for independence-minded factions. A Death Star might be tempted out to quell an uprising on an Outer Rim trade route only for its return coreward to be blocked by interdiction blockades, starving it of essential supply convoys.
Which brings up another point: Running costs. I seem to recall reading that even a single Death Star tended to eat up resource, personnel and maintenance budgets comparable to half a space fleet. Having more than a couple of them on active duty might simply be untenable on purely economic grounds, the hulking space stations acting as massive resource-sinks straining even galactic-scale military budgets.