Nowdays the complexity of car has turned it into "magic", too. Choosing the wrong oil weight for a modern turbocharged car will wreck the turbo and the engine. Another example is the new style of oil filters. They are cartridge style with very delicate torque specs. an over torqued oil filter housing cover will create a significant drop in oil pressure due to to a leak.
Heck, even changing a tire is now a mess due to the recently implanted tire pressure systems.
Imagine a world where people actually knew how to code. That means they would have enough skills to do basic math, and science. They would ask questions, rather than accept the answers given. They would challenge authority, rather than sit down and take orders.