I think you're selling Clojure short. Its emphasis on purity, STM, and persistent data structures is quite different from most other Lisp-like languages, and in

I think you're selling Clojure short. Its emphasis on purity, STM, and persistent data structures is quite different from most other Lisp-like languages, and indeed most other languages period. Those ideas have certain been tried elsewhere (Haskell, for example) but it's a path which is definitely not as well-trodden as you make it sound.