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In principle you can add full colors, image capabilities and direct manipulation of objects to a shell, see for example IPython (the Qt-shell) or Mathematica. Ultimately any large enough GUI application will add scripting support, take autocad for example. There are arguably tons of simple applications that are simpler to use if implemented as command line tools, for example video/audio conversion, archival tools

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>In principle you can add full colors, image capabilities and direct manipulation of objects to a shell, see for example IPython (the Qt-shell) or Mathematica.

Sure, but I'd call those GUI apps.

A GUI app can have textual command input, as it just needs a text entry widget to do so, but a CLI command can not have graphical elements -- since with CLI most people (including me) mean stuff that runs in a terminal, either with command line input or with some curses library.

In my eyes it is unfortunate that the terminal standard we are stuck with is dictated by a device designed in the 70s (vt100). There have been more advanced terminals, that had support for graphics and so on.

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