New larger and faster classes of Scows and Hulks added.
New Types are:
Lemmings in Spaaaacccce!
Restricting the use of hulks, smuggler ships, etc, seems to be raising the bar for new players who prior to this change could acquire an use these ships through trade. I also think that it is adding additional complication for very little gain. For these two reasons, I find the addition of berth levels questionable.
A level 10 spaceport is not difficult to achieve for a player that has gotten to the point where they have a use for smuggler ships beyond the fact that they go vrooom vroom. As for the hulks, I suspect the legacy hulks will be available for a long time.
Less developed empires have smaller ships and less need for gargantuan ones. It makes sense, and adds depth to the game.