I just noticed that only production facilities receive population bonus and mood bonus while spaceport doesn't. Not only that does not make sense in reality, it is also one of the primary reason why stock planet governors always have a hard time fitting into planets of different sizes. Is this just a careless bug or it is by design?
I also think population bonus should at most be logarithm to be rational. But I guess this one is acceptable since a few thousands extra logarithm function calls might bring noticeable performance hit.