It does. For example, you could pipe an output of diff and a GUI diff viewer starts up and it's a whole lot easier to see or merge the context and even you may

It does. For example, you could pipe an output of diff and a GUI diff viewer starts up and it's a whole lot easier to see or merge the context and even you may be able to launch a 'system default' app for that instead of a predefined app. And another apparent one is image viewer or editor.