I hope CS2 is more agnostic on transport mode. It would be nice to be able to create genuinely car-free cities in the game.
I’d love to see a city builder game with an extremely powerful policy builder feature. Let me design new rules and see how the city responds. For example, let me implement congestion charges on roads, even if it’s just a text input with its own DSL like you have with minecraft command blocks. Then you could really break out of what the developers designed and start actually doing simulations.
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Also curved roads and buildings don't need to be right besides the road, etc.
Sim City 4 is more like a suburbia simulator imo
Emergent paths would be fun, too; if you don't make the sidewalks and paths good enough, people start cutting across empty areas.