Because 'graphical' TUIs are pale imitations of GUIs. I don't have a TUI fetish, despite having grown up with them.
It is not a fetish, some people like this and others like that.
I like CLI more than TUI, and TUI more than GUI where appropriate. For working with text TUI is better, for e.g. images GUI (GIMP).
I love a GUI app but calling TUI usage "that" is utterly limiting and unfortunate to put it mildly. I moved entirely to CLI/TUI just because dumping notes, handoffs, anything, and everything I want even for a literally literary work (grammar etc; let alone coding/planning work) is infinitely better. Also, control edits/changes/shapes/etc better among many other things. GUI doesn't even come close (nope!). That' the reason I moved to almost 100% CLI/TUI.
“ 39. Re graphics: A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.”
Perlis has an aphorism for this, as he does every important problem [0].
[0] https://www.cs.yale.edu/homes/perlis-alan/quotes.html