>GUI is better for discoverability of the most common scenarios (I can right-click to see everything that can be done with the file...
You know the secrets on how to use the Microsoft Windows 95 GUI so it's easy for you. Consider the person who has not been trained over years in its use. The concept of a context menu that pops up at the mouse position when clicking button number two is not intuitive or discoverable.
My wife, for example, grew up before Windows 95 and its descendents were invented, holds multiple post-secondary degrees, and works with computers every day. She has no idea a second mouse button exists let alone that she can use it to perform file manipulation operations. She doesn't quite get the idea of "home directories" or "nested folders" or anything that is hidden like menus (or, frankly, tabs in the browser.. or multiple browser windows in fullscreen mode). Those things are not intuitive or discoverable in any way if you haven't been trained in their use. I, too, often forget the context menu is there although with practive I'm getting better. I certainly would never forget the `df` command though because it's second nature to me after over 40 years of use.
People need to be very careful when making an argument that something is better because it's what they're familiar with as if they are some definitive exemplar.