I guess for people who like types whatever tools Elixir comes up with will never match a true typed language like Java or Kotlin. Was the whole thing really worth a rewrite - have no idea. They also mentioned lack of libraries. I don't really understand people who argue for types in a micro/small service environment. Most people don't work on a million LOC codebase anymore, instead they have a few dozens small-medium sized services. That's the current fad at least. So why is refactoring so painful in a dynamic language on a medium service? Brex didn't really provide much details here I have to say.