Unlike invoking bash (or whatever) as a process, this is much lighter weight and returns a sequence of objects with properties. You can trivially bind those to UI controls such as data tables.
Similarly the virtual file system providers expose metadata programmatically such as “available operations”, all of which adhere to uniform interfaces. You can write a generic UI once for copy, paste, expand folder, etc and turn them on or off as needed to show only what’s available at each hierarchy level.
As an example, the Citrix management consoles all work like this. Anything you can do in the GUI you can do in the CLI by definition because the GUI is just some widgets driving the same CLI code.
