I'll say the high learning curve statement isn't really true for Erlang either. I was up and running with Erlang as a mid level dev back in 2013 or so within 2 weeks. Worked through LYSE, and basically grokked everything I needed to, genservers and OTP included. Only thing tricky after that was building a release (since at the time the best tooling was rebar; Elixir's mix makes this really simple).