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.