I do live in a dense city with rail and it's slower, especially accounting for last-mile transit. Rail does have traffic, they just sit next to you and you have to navigate around them on foot.

It's also not true that there's no advantage to Waymo; I take rideshare and taxis everywhere, and it will be a massive draw turning that into a pure transaction with a robot instead of it being a potentially social experience based on the whims and social malfunctions of the driver you get that day. As soon as Waymo or equivalent is available everywhere I will never choose to take a human-driven car again. And that's before getting into the many traffic advantages afforded to a fleet of cars that act as a collaborative swarm.

To me that does describe the greater good. For all its real benefits, passenger rail is inflexible and bulky in comparison.