I should also say that we only of late learned again how to cheat entropy properly.
In the dark ages without EE, and before the rise of Ex Nihilo, it would have been a very strange beast indeed. Not completely impossible, there's still creative mode goodies that can hand out more then they take in, and those could have been piped within the beast to trade-o-mats and forestry trade machines as you unlocked them. The mechanic would have ended up with you bringing piles of low level resources to the chambers of the beast, then bringing back the proper raw materials. You'd then construct the items, and take them back to The BEAST...
... sounds a little like the economic history of European Colonization, if you think about it.