Haskell as a research language was very successful. It taught us a lot things: - Monads work as a way to isolate side-effects; - Lazy by default is a bad idea

Haskell as a research language was very successful. It taught us a lot things: - Monads work as a way to isolate side-effects; - Lazy by default is a bad idea; - Overly academic programming languages generate toxic community.