On the other hand, there is also an advantage to moving quickly. Waymo seems to be far ahead, but if others (like Tesla?) release their self-driving vehicles prematurely, that would cause a backlash perhaps against the whole industry. (For example, Uber's self-driving cars running red lights in San Francisco I think helped result in tighter regulations across California.)
Moving quickly to show that the technology is safe might prevent a heavy-handed regulatory backlash.
That is also my impression, and it scares me that they have been so aggressive getting something "autonomous" to market.
If flaky products are released that end up killing drivers (or worse, pedestrians), it'll set the entire self-driving tech sector back 5 years or longer.
Moving quickly to show that the technology is safe might prevent a heavy-handed regulatory backlash.