> The people that keep arguing for TUIs for everything seem like religious fundamentalists that can't be convinced with any argument that user interfaces should be about the user, and need to adapt to the task at hand.

We are users.

> Why can't developers understanding that GUIs and TUIs both have their usage, it just depends on the task?

Isn't that the case for most TUI apps? They tend to serve quite specific purposes. Nobody writes a WYSIWYG word processor in a TUI. Because you can't and even if you could somehow with sixels it would work horribly bad.