Pfft, I'll be impressed when Emacs runs as pid 1, has an inittab.el, mounts filesystems, sets up swap, starts daemons, launches X, reaps zombines, and deals with shutdown. I'm sort of surprised nobody's done that yet.
Fwiw I use EXWM in Guix and only interact with the computer through emacs (though I do need to use terminal and eshell).
Please, don't give Poettering ideas. He has enough, already. /s