I don't know what planet you're living in, but the Python ecosystem is about the most mature and modern I have ever seen for modern development in dynamically t

I don't know what planet you're living in, but the Python ecosystem is about the most mature and modern I have ever seen for modern development in dynamically typed, interpreted languages with a strong web presence.. Take a look around and the equivalent libraries of the languages you mentioned. Honestly, the quality of similar libraries for the functionality that you need is lower, and the featureset smaller. Javascript suffers from all the problems of a "teenage" tech: immaturity, lack of established libs, poor documentation, and some astoundingly bad coding practices out in the wild. Clojure's ecosystem is very small, and has the same issues with code stability and lack of decent mainstream library alternatives. Erlang, though a great language, has some issues with its unfriendly ecosystem and a general lack of libraries for many common tasks. Go, while gaining serious momentum, still seems to suffer from a substantial lack of features to compete in the same rapid development niche that Python, Ruby and JS attempt to point to, although it was never meant for that role anyway.