It’s easy to say that now but at the time there were obvious huge obstacles to Apple doing a great cell phone.
And not just technical; the business relationships between cellular network owners, handset manufacturers, and software companies was totally different. Apple essentially had to restructure the industry to make the iPhone what it is today.
I suspect a car would need to have a similar impact in order for Apple to succeed. They would need to launch a new kind of product that just happens to have the shape of a car.