Clojure/java also have lots of libraries and tools around them, as well as proper promises (where you can block and wait if you want), channels/goroutines, futu

Clojure/java also have lots of libraries and tools around them, as well as proper promises (where you can block and wait if you want), channels/goroutines, futures, threads, agents, reducers, etc. Erlang / Haskell / even Go are saner languages with better concurrency stories. I guess there's something to be said for not having to learn more than one language. Probably something vulgar.