But in the article all these GUIs are vibe coded. Tell your AI to allow more than one window. What's the problem?
Imagine if there were no terminal/pty system. Then what, I'd have to use Claude Desktop (doesn't support multiple windows) and Finder?
So no, it's not the only argument for TUIs.
They are usually tied to specific user accounts, it's true. But that's something some people made up, and it doesn't have to be that way.