Leyrann
Deity
I dont want all resources to have the same yield. Thats not what I said. I just want stone to not be improved at the very end of the game (Rocketry) since stone has been used in the BC Era.
Stone can have a crappy yield - but why is it +1 production at the very end game tech when one is building Spaceports??
And as another poster pointed out Stone is used in concrete. Concrete was developed in the 1800s. Well before Rocketry. Also arguably Romans back in there era enhanced Stone to be Concrete. All in all stone should be "boosted" earlier than when we built NASA and flew to Mars. That's not when we magically discovered how to improve stone.
But it's not stone that's improved, it's the quarry. Rocketry comes with advances in propulsion technology. Because propulsion really is a kind of controlled explosion, that may very well mean it also comes with better techniques to get that stone out of the quarry.