Sure scale wise the game is the biggest in its way atm. But that alone wont impress a lot people. And tbh its not really that huge when you break it down to the part of the galaxy where everything is going on. Everything happens in the starting region of the galaxy if you go outside that bubble its gets pretty empty. And as far as i know is PP also only focused at that bubble. So yea its big but still somehow not.
Plenty of room for growth then.