I wasn't addressing the intrinsic complexity , but the distribution, storage, shipping, and the required infrastructure for a support network. Your iPad stops working, you can ship it, or drive it to an Apple store, your __car__ fails, you've lost your ability to go from A_to_B, and you certainly can't ship it.
I show up at the Apple store with a fried iPhone, they might just walk in back, grab a new one, swap the sim, I'm good to go. My car fails, they don't swap it out, it goes into a maintenance/repair process, now I need a loaner (and if Apple supplied those, where are they stored/maintained), it has to get from the failure location to some kind of Apple authorized repair location (and even if they could just "swap it out", you realize that would require an update of registration, tag, insurance, as those are associated with your VIN).
There are absolutely all sorts of logistic issues present in producing, selling and supporting a vehicle that aren't present in a small, portal electronic device.