Drawing a “nonsense” line between TUIs and GUIs is pretty arbitrary, it’s all pixels on a screen at the end of the day. People like the TUI vibe, and that’s a good enough reason to make and use them.
I love TUIs but one main reason for that is that they're keyboard centric. If I have to use the mouse it kills it for me, if both work then it's fine. I hope that modern TUI makers keep this in mind. What's great about the keyboard centric is that with a few keystrokes/shortcuts it's very easy to do repeatable work and takes less energy than hunting boxes to click on with the mouse.
TUIs aren't more inherently keyboard driven than well constructed GUIs. You can easily make a keyboard driven GUI that has all the shortcuts you'd add to a TUI. (Just don't let the "UX design experts" near it.)
The problem is that UX experts are attracted to the TUI space and may ruin it for us all with all kind of things that don’t make sense. TUIs are more likely to be keyboard centric our of necessity when mouse isn’t available or used sparsely.
I actually agree with that. And I enjoy the fact that TUIs are becoming popular. But there is more to it than just the 'vibe'.
The vibe might not be a necessary reason, but it is a sufficient one.