Well, I don't think the writer proved the importance of UI.
But I think it serves as an excellent reminder that, for a cmdline program, the flags and arguments are the UI, they impact how people perceive your software and how productive they will be with it.
But I think it serves as an excellent reminder that, for a cmdline program, the flags and arguments are the UI, they impact how people perceive your software and how productive they will be with it.