Starbase spamming in GC3 is pretty out of control imo, and without Logistics being a limiting factor (ala GC2), there's nothing to stop a player from just dropping infinte Starbases. This is made even more possible by the fact that the AI doesn't even think about getting aggressive until like turn 100, so once the colonization phase is over there is basically nothing else you need to build at Shipyards other than constructors.