TUI are often inferior to GUI from a user perspective, but not necessarily by much.

On the other hand, they are easier to build in a cross platform manner.

Linux is probably the most difficult platform to build GUI for, because of all the fragmentation, X11, Wayland, all the different flavors of GUI toolkits, driver issues, window managers issues, font issues etc.

TUI are a bit like web apps in that regard, using the terminal instead of a browser to abstract the platform.