I've used Elixir professionally for 6 years and have been very impressed with how it's been managed. All additions seem very careful and deliberate. I can't think of any regression or issue I've had as the language and tooling and standard library have improved.

Given that, I'm excited to see how this works out. Adding static types has the potential to be very disruptive but I trust the team to do it in a way that will work very well with existing Elixir apps and the BEAM VM.