If your goal is to achieve realistic looking city streets the best way to do that isn't an expensive online infrastructure and much more advanced simulation.
If the developers had the skills and time to do that they could more easily have more dense NPC crowds and richer local simulation.
The reason the games aren't already like that is likely just cost, talent, and target performance, which you'd need a lot more of to execute your plan.
we just need to use natural gas as a bridge fuel trust me, let's just build pipelines and special refineries and special cargo ships that can handle these new fossil fuel supply chains. just a bridge fuel though just until solar catches up don't worry they're just multi decade leases of course we're going to hit net zero trust me just use gas it's clean burning trust me just ship the gas across the world it's the greenest choice there is just trust me