Why does a city need ~100 L3 chargers per km2? People don't need to drive as far within a city, so even home L1 chargers should handle most city residents needs

Why does a city need ~100 L3 chargers per km2? People don't need to drive as far within a city, so even home L1 chargers should handle most city residents needs. The L3 chargers seem most useful on highways exiting the city.