At the same time, nobody ever questions what you don't learn to drive a car. You have one acceleration pedal; you don't have separate controls for the fuel/air mixture and ignition timings. You don't manually control the differential. You have one brake pedal, not separate ones for the front and rear brakes, and automatic anti-lock braking is even a useful safety feature.

Modern cars even have warnings for tire pressure, so the driver has less need to manually check.

Modern cars are so smart that a 16 year old can buy one and drive it without having to know how to rebuild the engine, unlike cars of a hundred years ago.

The trick is that we have a long cultural history of deciding just what aspects of car driving are non-trivial and need to be learned and what aspects can be automated successfully (or even beneficially). Consumer computing is still in its relative infancy, and it's a moving target.