The complexity is still vastly different with cars than any electronic device Apple builds. All those individual items you list are likely in your future car if not already there buried among a hundred to thousand more such complex items.

While Apple may be supply chain wizards in electronics they would need to replicate it many times over to build cars and even then create a whole new distribution and support system.

I think their best bet is to be the smarts of all cars, why restrict themselves to just their own cars. Just launching one car would cost them a sizable chunk of their money trying to launch more than one would be many times more difficult, just ask Tesla. Tesla isn't out of the woods because unlike Apple they don't have the reserves to spend; assuming Apple stock holders would go along with the idea of spending tens of billions to start yet another car company.

No, I think Apple is better at being another supplier and getting everyone into their game. That gives them more flexibility and more penetration for a lot less. They are likely also the only company that could get their logos on the screens of all cars