but then, you could have tons of starbases added to your fleet, making it nearly unstoppable. you could build one in each gravwell, then they could all phase jump to one spot. even w/ just one starbase, it would be a huge advantage.
and besides, the devs tried to get it better at anti structure w/ the disintegrator weapon and faster building in enemy territory. it's not quite ideal, but in my opinion, that starbase has an advantage over the others since it can move, and is effective with players that actually would go around the starbase (unlike the ai). So, they maybe were trying to balance it out a little.