The thing is in many cases you had to make a choice between performance and productivity. With things like Elixir/Phoenix you don't really have to make that cho

The thing is in many cases you had to make a choice between performance and productivity. With things like Elixir/Phoenix you don't really have to make that choice. Maturity argument again is moot as you are building on top of Erlang/BEAM that's very mature and has very good tooling. For people coming from Ruby the syntax also makes transitioning less of a pain.