The final mile is always the killer. And the greater the number of destinations, the more complex and impractical a mass transit system becomes. This is the fly in the ointment that nobody ever seems to want to address directly.

Yes, a car is inefficient in terms of number of ass cheeks moved per square footage taken up. However, every single one of those cars can (and probably is) delivering its occupant to a different destination, and in most cases practically directly to it. A train cannot do this. A bus cannot do this. Trains are excellent at moving a large number of people from a relatively small high concentration geographical area to another single location with a high demand destination nearby. A bus is decent at moving a moderate number of people along a predefined corridor, provided the passengers do not have particularly specific requirements of when they leave or arrive. But the more stops you add for the bus or train, the slower and slower it gets. If you compensate for this by adding more routes, the number of connections a passenger must make to get from one specific destination to another makes the amount of time taken pretty much totally nonviable once you reach 4 or 5.

Single or limited destination mass transit methods can never be a total replacement for individual transportation. However, that individual transportation doesn't necessarily need to be a car. Bicycles, scooters, and motorcycles are more space efficient per number of passengers, especially if only 1 or 2 passengers need to travel at a time (see also: Southeast Asia).

All of these methods need to coexist to create a functional and balanced transit system. There is no silver bullet, and the issue is much more complex than a single smarmy bar graph.