It's highly available but not accessible, ie immediately graspable by a new user. For example, most tutorials take the view that before you can write any JS you first have to know (or learn about) creating a basic web page. Of course, this is quite often what people want to do, but on the other hand they might be better off using node.js or some other hosted interpreter like http://math.chapman.edu/~jipsen/js/

I think there's a lot of value in letting people approach programming through doing very simple stuff such as automating calculations. Of course a potential downside to that, which was a big problem for Basic, is that this can get in the way of learning about program structure early on and encourages spaghetti code.