cars arent computers (yet)
Most users just expect their PCs to work. They have no more wish to be IT specialist than they wish to get their hands dirty servicing their cars.
I am not sure that is a viable model.
When you buy a car, you get everything from the manufacturer that you are going to use for the lifetime of the car (and this is ignoring the recalls, services etc that cars need). You also have to pay for insurance, tax and, importantly, pass a test showing you have practical competence before you are allowed to use the device.
Can you imagine saying I want an MS PC which can only run the MS software available at the time the PC was released and can only visit MS websites to make sure no browserpwnage takes place?
Then finding out that every 6 - 12 months (depending on how often you use the computer) you need to take it back to an MS approved dealer to have it serviced and whatever the analogies for tyres / windscreen wipers / washerfluid etc are.
Added in to this, you have to pay £400 a year to insure your device incase something you stupidly do causes a problem for other internet users, you have to pay an annual tax to be allowed to surf the internet (not just ISP fees), and you can only buy it if you can prove you have learned enough to use it safely. In the event you do anything risky you get points on your computer licence and should you get hacked and it causes problems for other internet users you get fined or go to jail.
The reality is, people dont want to be IT specialists but want to put their computers through all kinds of unexpected activities. They attach disks they get off their mates, they plug in USB sticks, they visit sites, they click "accept" on pop ups and they (willingly or otherwise) install vast quantities of random software. They need to understand more about what they are doing or stick to living in the walled gardens of Apple devices.