TBF the argument that some people use GitHub because it offers a more pleasant experience than using git itself (via the CLI) might have some truth to it. But saying "GitHub is what most people use because it makes the complexities of git easier" goes a bit too far. Local git GUIs like Sublime Merge are better for that - GitHub might help you with the complexities of collaborating with others using git, but it won't save your ass if you've got your local repo in some wonky state...