I've placed limits to farms (2 per world), embassies (2/wrld), markets (3/wrld) and entertainment buildings (2/wrld) and experienced tougher economic development.   Looks like specialized worlds work better for economic issues. However, the AI now doesn't build LOTS of embassies, for example, and seems to build better colonies, tougher to invade and yummier after the victory. I think it was a trade-off placing limits in that improvements.