Choosing Elixir for the code, not for the performance https://pragtob.wordpress.com/2017/07/26/choosing-elixir-for-the-code-not-the-performance/
I stumbled upon an interesting article about choosing Elixir for the (healthiness) of the code and not because auf performance reasons.
While I agree that performance alone is a bad reason to choose a tech stack I still think that performance is important. On the other hand expressiveness and effectiveness of the language are important as well. He makes a pretty good case.