I was just about to destroy the Pirate Base with a nice fleet in their system when the next pirate raid was starting and the 20 or so raid ships popped out from nowhere in the Pirate system. Please change that in an upcoming patch, it's not like the ships are phase-shifting in from a twin-galaxy or materializing from nowhere, that makes no sense at all

Let the pirates build their raid fleet one ship after the other, just like we players or the AI do.