You don't need to learn how git works internally to be able to use it. You need to know a lot about filesystems in order to use them: Folders, files, symbolic links, copy, cut, paste, how folders can exist on different devices, etc. There's just a tonne of assumed knowledge regarding them, and it's very obvious when you meet someone that doesn't have it (regular people often don't have all it).

Subversion also isn't some thing humming along invisibly in the background, it has its own quirks that you need to learn or you'll get stung.