Elm's creator is a visionary [1]. E.g. Redux took inspiration from his thoughts. Rust's compiler error messages also. It was rather common on elm core newsgroup to see him asking for secrecy on new ideas before releasing a new version of Elm.

The negative part is that Elm's development is rather slow and not pragmatic. This is painful on the short term - specially if you come from JS land..

[1] An example of a (great) conceptual talk: https://www.deconstructconf.com/2017/evan-czaplicki-on-story...