You can use it without going through Go, and have proper support for normal JavaScript. The concepts are explained here: http://jlongster.com/Taming-the-Asynchronous-Beast-with-CSP-... (EDIT: I see now you are asking why go's channels are more powerful than core.async's)

The library: https://github.com/ubolonton/js-csp

no need for channel operations inside (go ) forms. Can be done anywhere.

Also, I meant clojurescript core.async, not clojure.