>And then there's the Phoenix framework. Chris McCord wanted this MVC framework for Erlang, where Elixir is based on Erlang, used mostly for large scale backend systems. And Phoenix would be the Rails to Erlang's Ruby (Elixir). The learning curve is steep, you will need to learn OTP. Which is probably why adoption lags."

This is false, you do not need to know OTP to be productive.

These days if I'm forced to work with Rails, I almost always write functionaly-kinda-ish Ruby code. Elixir sold me heavily on the idea of one input in, one input out and all the other good that comes from functional programming.

I probably no longer write idiomatic Rails code (40 methods in a ruby model).