Right. You identified the prime characteristic for the CUI crowd: no context switching. Though Wordstar purportedly was superior for text manipulation.
Robert J. Sawyer wrote an article [1] on why he still uses it. Made me want to learn it, but I realize that if I'm going to put effort into learning a tool, I'd likely want it to be Emacs instead. (I currently use Scrivener.)
[1] https://arstechnica.com/information-technology/2017/03/words...