Comment by IshKebab
Nix is enormously complicated, kind of unstable and not well documented.
I get that if you've gone through the pain of learning it you get a system with some very nice properties. But casually suggesting "maybe try nix" is a bit like telling someone who wants to listen to Mozart "maybe try playing a piano".
How is it unstable? It's one of the most reliable pieces of software I have used honestly.
In any case 'nix-shell -p erlang|elixir' does not seem too complicated to me.