I hear the "you shouldn't have to learn how your engine works just to drive a car" argument often used to counter my insistence on learning git's internals to understand its externals.
My response: git is a tool for professionals. Racecar drivers should definitely understand how engines work. Amateur users of version control systems are using the undo and redo buttons in a Google Document. Git is a professional tool and if you're a professional then you have a professional obligation to learn your tools properly.
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