That is not unique to TUIs, but also possible in GUIs where the developers care, and in some games (try the GUI ("tiles") version of Brogue). You can definitely make a GUI that updates in an instant and be fully keyboard-driven, even if that may have been more common last century.
We’re comparing TUI with web browsers for good reason. I don’t see any reason to add game engines to that debate. I have never seen a business client move any application from a TUI to a Unity based UI. I’ve never even heard of anyone considering a game engine in the architecture of a business application. So what you’re saying may well be true but it’s akin to a rare mythical creature, does it even exist?
