“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."

The author has no idea what they are talking when it comes to the alternatives.

I was making simple CRUD apps in Phoenix (the types of apps I would normally use rails for) for a year before I even looked at OTP. You can become productive in elixir and Phoenix very quickly especially if you come from a ruby/rails background.

I recall a blog post by dockyard where they said they had new hires making commits within the first week.