> If you drive a car do you need to be aware of its internals?

You walked yourself into an obvious answer there: yes, to a limited extent you do. That includes understanding a bare minimum about tires, the engine (what noises are normal, what noises aren't normal), oil changing (why, when), windshield washer fluid, basic indications of electric problems, basics about the need to change brakes (indications of brakes going bad, why they need changed), the basics of the parking brake (and not to drive with it engaged and why), the usefulness of different types of tires (for example snow tires), why you shouldn't needlessly over-rev an engine frequently (or do stupid things like over-rev it for an hour while parked), how turn signals work and the need to make sure the lights on your vehicle are functioning, how high beams work (or at least how to use them), how gear shifting works and why it's important not to thrash your transmission (what abnormal shifting sounds like, why that matters), this list keeps going and I've really only covered primitive things that most or all drivers should know within the first year or so of driving.

Continuing the comparison that means people need to understand not to cold power off the computer, not the specifics of CSS, JS and HTML. Note that cars are also going to be more and more abstracted away with automatic gear shifting (now I don't need to understand how gear shifting works). Do people really need to understand how CPU work to do their banking?

Most drivers don't concern themselves with the alloy composition of their catalysator or the exact air-to-fuel ratio in their cylinder headers or the necessary pressure in the breakheads during an emergency halt.

Or the composition of the road below them in exact ratios of chemical components.