Emacs only having elispallows me to fix the third party code that I have in my config, and simplifies all the things. Thoemacs already has C too now, there is module support. I guess it could be possible to use Rust via that interface too, and maybe go. But better keep these to a minimum because elisp is one of the things that makes emacs great
Emacs has really good support for it which continues to improve over time.
But.. I love more than one language (and more than one Lisp for sure). Will you try to persuade me that I am wrong in that regard?