Earlier quoted context omitted.
Waymo is public transport, but you mean mass transit. People don't use mass transit because it sucks, blaming other modes of public transit doesn't cut it. The design and implementation of it is what keeps people from using it. The good news is automated vehicles will add flexible options for new types of public transport that are between single-trip taxies and mass transit and will lower costs to all kinds of public…
European and Asian nations tend to have perfectly usable mass transit (including developing countries). Sure there are some us cases for cars, but for daily commute its not needed. To add to it mass transit is generally heavuly subsidized that means that less well off people can get to work/school at low costs. It reduces poverty and income inequality.
I live in Europe in a village of about 1500 people are there is no usable public transport (2 buses a day).
Relative to total area, mass transit is almost nowhere. That's also true for for total road kilometers.
I agree with your last sentence, but for those who live outside of cities or other places of high density, public transport is unusable or unavailable. Governments roundly ignore people who live in these places (due to expense and political irrelevance) so there is always a fairly decent percentage of the population that is "public transport poor".