Earlier quoted context omitted.
Should I also learn how to repair my car instead of just taking it to the dealer? It’s called specialization of labor. Most of us make an above average wage dealing with computers and pay other people to know things we don’t know.
Maybe you don't need to know how to repair your car, but it's easily arguable that every car driver should recognize the things happening in their cars, otherwise, they are an unsafe driver. On the simple side of things, is your check engine light on, are you dragging your air dams, are your lights on, do your tires have any tread. Slightly more complex, recognizing that your car is over heating, recognizing burning…
Most problems with cars (except maybe tread), you get some combination of an indicator light, something smells funny, sounds funny, or your car drives differently. In either case, you either take it to a mechanic or if it can’t be driven, you get it towed.