You're right, but you misunderstand the OP. Ruby, for example, has "advisory privacy". Private methods aren't shown in generated documentation but can be called

You're right, but you misunderstand the OP. Ruby, for example, has "advisory privacy". Private methods aren't shown in generated documentation but can be called if you really want. On your analogy, the car has a small number of controls visible and they're all you need 99% of the time. But the engine compartment isn't welded shut.