This reminds me of "Emacs as PID 1" from a decade ago, to which I sadly cannot find a link anymore
I knew someone who ran it with inittab about 3 decades ago, and I very much doubt they were the only one. Emacs could be used as a full-blown OS long ago. It just depends on your needs.
Also, the psychotherapist was one of a kind ;)
Personally, I could live with tmux or zellij as PID 1. Because from there I can do everything, except GUI. Might as well use Sway then to achieve virtually the same.
I think this may be it (or something similar).
https://web.archive.org/web/20041030060909/http://www.inform...