If that's the only justification, a good window manager might turn out to be a lot more convenient.

Terminals are great for CLI. CLI integrated into GUI/TUI is absolutely amazing, but 99% TUI apps do not work like that, they're just awkward crutches foreign to the terminal, so you get no upsides and all downsides. Examples of good CLI integration I regularly use: Kate, Zed, Dolphin, Total Commander, pi. Only one of them is TUI, and honestly it's much worse off with it, since it has to display a ton of formatted text and sometimes pictures. It's really inconvenient and just looks like cargo cult rather than a necessity.