More specifically it's an interface designed for a physical keyboard. Or even more specifically it's designed for precise and easy human text input.

especially where you typically type with all fingers instead of just your thumbs

Sure it is. I, and millions of others, use it all the time with for example Termux.

My Ratatui test app (Conway's Life) runs great in Termux. :)

Termux is seriously amazing (with its quirks, of course)!

Have you tried porting your test app to a web page? I'd really like to have a good TUI experience on the web.