Have you played Cities: Skylines? There are definitely limitations to its fidelity, but every person and car is something you can click on and see their home, job, route. This gives much more realistic traffic for one thing (though there are mods that do an even better job).

Ultimately though, I doubt that high fidelity simulations are in the cards for consumer devices any time soon. Cities Skylines already bogs down on large cities.

MATSim or ActivitySim are used for that sort of thing. Most modellers don't bother to simulate every individual person though. Instead they use a sample which they scale up because it isn't worth the order of magnitude more computing time when just simulating a representative 10% does fine.