Replicated buildings degrade quicklyEver wonder why when you take over an enemy section their buildings are in a bad way? Items created though the Matter Replicator require constant maintenance, so when an enemy is defeated there are no scuzzers to maintain then and they start to break down.
The stations are Lost TechnologyNotice how the stations have teleporters as lifts, but teleporters that work on organics are rare outside this? Nobody knows how they work and other teleporters are dangerous, expensive or don't work on (living) organic life.
All stations are host to an aggressive moldIts why the building need constant cleaning and maintenance, its why people keep going to the sick bay, its why goods left on the deck spoil so quickly.