I thought Echoes of Civilization did a good job with the resources. In that mod iron is used for autobahns and a trucking corp whereas horses are used for race tracks and oil is also used for plastics factories.
Also aluminum is used for aircraft whereas oil is used for tanks, rocket artillery, and some ships.
The system is simple and enhances gameplay in my opinion but there are also some other good mods like Petroleum or Industrial Steel.
I know you can always flog your obsolete resources to other civs for money but it feels cheesy because the AI isn't valuing the resource correctly in modern times - it would be much better if the resources kept an actual gameplay use.
Circuses and trade route yields are something at least but I'd like to see something extra along the lines of the mods.
Also aluminum is used for aircraft whereas oil is used for tanks, rocket artillery, and some ships.
The system is simple and enhances gameplay in my opinion but there are also some other good mods like Petroleum or Industrial Steel.
I know you can always flog your obsolete resources to other civs for money but it feels cheesy because the AI isn't valuing the resource correctly in modern times - it would be much better if the resources kept an actual gameplay use.
Circuses and trade route yields are something at least but I'd like to see something extra along the lines of the mods.