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> Nobody understands everything about how an airplane works, not even the lead engineers. Nobody understands everything about how a car works

Of course people do.

Doubtful. The engine engineer doesn’t know the chemical engineering of modern fuels nor the code in the engine controller.

In my country in order to earn a true CS degree you need to learn both Chemistry and EE.

Also check the Homebrew CPU running a custom port of Minix 2 with in-place ported C compilers, linkers and assemblers.

I had to learn geology and engineering drawing, because the first two years syllabus overlapped with civil and electromechanical engineering.