> Waymo is a sort of public transit.

Definitely, and at no cost to taxpayers.

> It's just an vastly more inefficient than any other form of public transit

Waymo is less efficient in the narrow case of transporting hundreds of people between two specific points at a specific time, but more efficient for almost every other case.

If Waymo had dedicated right-of-way in the same way trains do, it would be more efficient.