Should CLI (command line interface) have a nice UI library?
There are many. The generic underlying library is usually
ncurses.
But it needs to be stressed that there are many. For Python there is
Textualize [1], for Go there is Charm [2], rust has a TUI crate [3]
among other options.
Also, OP might be interested in this list of "Modern Unix" tools. [4]
Cheers,
Tom
[1] https://www.textualize.io
[2] https://github.com/charmbracelet
[3] https://docs.rs/tui/latest/tui/
[4] https://github.com/ibraheemdev/modern-unix