On the flip side, the different biases of different manufacturers might not go so well together. Toyota couldn't get the software for an accelerator pedal right, so I have zero confidence that the 2030 self-driving Prius won't just e.g. drive 15 mph under the speed limit everywhere, camp out in the passing lane, stop for at least 30 seconds when switching from reverse to forward, and gridlock in shopping center parking lots.

Then again, as someone who won't buy a self-driving car for as long as possible, it might be fun to learn the driving styles of different self-driving cars and use them to my advantage. E.g. If I know that tailgating a Prius which is going the speed limit in the left lane will cause it to move over in self-driving mode, or that a Mirai will always brake-check itself when it gets cut off, it might be possible to exert some control over them if it's advantageous in traffic to do so.