I really don’t think that the command line is a uniform interface. Every command has its own syntax, its own take on what its switches mean, its own take on regexes/globs and so on. Moving and editing files is something completely different: one is a simple command to move a file elsewhere, the other is a whole experience which replaces the command line with something that looks completely different and is controlled completely differently. What they do have in common is just the medium - the terminal.
Many developers of command line tools try to at least keep a similar design language as the rest of the world, but it is far from perfect. A lot of these interfaces are like they are for mostly historical reasons without proper planning of the user interface, so imho even something like Material Design is already closer to being the “same interface” in the GUI world than the various command line interfaces are.
we can’t simply reuse the command line
We absolutely can and some of us do. I often manage my files, todo list, etc. in Termux. Its not always the best thing to do, but I like that I can keep a consistent interface no matter what device I am using. Its still the same terminal, just on a smaller screen with a worse keyboard.