> TUIs and GUIs are both mostly bad for the same reason, you have to learn a new “language” of interaction for with each program ... Stop building user interfaces in general. A command line interface is best.

A command-line interface is a "language" like any other. Each tool has its distinctive keywords, many have complex non-standard grammars (e.g., openssl, ffmpeg). And for more complex tools, the learning curve for this language is hilariously steep. I've been using ffmpeg on and off for two decades and I still feel quite helpless with it.

I think your argument makes sense, but it's just an argument for a standardized language, whether that's GUI, TUI, or CLI. Unfortunately, every other program or class of programs tries to innovate in some weird way. There's no reason why switching from Photoshop to GIMP should be so confusing, but it is.