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Sometimes it is not correct, if you are talking about systems. You cannot explain timing belt without engine internals explanation. And explaining engine is simple, but explaining mechanics that interact with the belt is large. You have to give tons of info to create a landscape.
You can explain Linux easily. But you cannot explain POSIX API performance details in a simple and fast manner. You have to create a framework to put knowledge in a person. If experts can explain something simply, why we still have universities?
