Is there a conceptual difference between GUI and TUI? Same UI elements, only represented by different technical means. CLI is different, but CLI does not have to be text-only.
TUIs are pretty much driven by keyboard input. GUI's are mostly mouse oriented. That's a big difference.
I have seen people use terminal data entry applications (mostly using the NumPad part of keyboard) with such speed/accuracy, no one using a GUI/Mouse will be able to match.
GUIs normally support keyboard navigation and TUIs can often use mouse. Some application may support keyboard poorly, but that would be the problem with that particular application, or GUI toolkit it uses, rather than the general GUI/TUI distinction.
