After the ground portion of the Starport was overrun, this became another critical juncture in the war.
In space, the resistance of the Fortress Starport henceforth became meaningless.
Unlike starships, a Space Starport is not a facility that can operate completely independently; it relies heavily on the ground for supplies, even a portion of its energy comes directly from the ground.
After the ground was taken, not only was the supply line cut off, but Cai Minjin's forces could use the space elevator to quickly and massively transport land forces to the Starport's interior via the orbiting spacecraft captured on the ground, attacking directly from within.
With no defense, no reinforcements, and no supplies, what was there left to defend in this Starport?