Benefits of elixir other than OTP

A simple question, I started a project , - Api + channels in elixir/phoenix and a ionic mobile app - , I’m not using the killer features of elixir as OTP (I know channels use OTP but I’m not using OTP explicitly). Am I still getting the benefits of elixir speed even though I don’t use OTP? or if I don’t use OTP at the end it’s the same if I write the API in elixir, ruby, python etc?