The only problem, in my opinion, is the lack of explicit types. From what I can see, the compiler provides some safety that doesn't exist in typical scripting languages. But I think we're pretty much at a point where so many of the commonly used scripting language idioms can be effectively described in a type system. TypeScript proves this. But it also proves that's it's still pretty difficult to add types to a programming language ecosystem after the fact, so it feels like that ship has likely sailed for Elixir.