Agreed. We could the git example a step further and define an alias for it and make 'git che[tab] master' 'git c master'. With an alias as shell level we could

Agreed. We could the git example a step further and define an alias for it and make 'git che[tab] master' 'git c master'. With an alias as shell level we could even make it 'gc master'. But the real benefits lie in automation of tasks like git-flow allows you to. Sure, it's theoretically possible for GUIs to provide interfaces that allow a similar level of customization and automation, but I can't think of a good example.