Seriously, what does that look like? What are the attributes of a person who is good at integrating hardware and software on a phone, and who also is good at integrating hardware and software on a self-driving car? Your example was jerkiness in acceleration and deceleration. The people who are good at mitigating jerkiness in acceleration and deceleration are presumably mechanical engineers and roboticists/AI guys. I don't think that any of those people have been involved in Apple's flagship, reputation-making products so far.
As you allude to, it's easy to say "do the same thing but better." If all you needed was a product guy who was like, "Hey, we should make this better," then it would already be solved.
