Computers in Apollo programme controlled most of the function with minimal human involvement in the loop. The dynamic systems were orders of magnitude more complex than what you find in a modern vehicle.

Also I can assure you no-one at Cariad had to write an MP3 decoder. And speaking of sensor control, my car (on its 4th year now) still fails to unfold the mirrors once in a while.

We also have huge, orders of magnitude advances in tooling and process since mid-1960s. For starters you don't have to weave your program into magnetic core fabric by hand.