Right now on my desktop I see 4 TUI windows, and 11 GUI windows.
A full-featured web browser or a video chat client can't be realistically made TUI. I could have run Emacs in TUI mode, but I appreciate variable font support in non-code texts I write.
For the videochat client it could be one video window with several panes (PIP, main+side small, ...) with a textual interface for controls, chatting etc.
This is what I find difficult to understand, why is that important? And to whom?
It made sense 35 years ago when MS-DOS was shipped by default and you just had to make do.