One complaint that the ClosureScript domain makes of JavaScript is the hoisting of variables. I do not disagree that it can be complicated and that there are other deep challenges. However, ClosureScript has its own warts. a) it compiles or translates to JavaScript so one needs to know both regardless. b) ClosureScript has its own idioms which are no less bothersome. At the end of the day there are more people that are effective with JavaScript than ClosureScript.