[smtf]

I agree that js does support the async paradigm for the reason you mentioned; however, at the risk of sounding like I'm speaking for the op js would not be my first choice for system or server side programming. The simple reason being that javascript's behavior is often near inexplicable, many examples can be found here: http://wtfjs.com. I'm tolerant of that strangeness while manipulating the DOM but really only because there are no other choices.

[ricardobeat]

Every language has it's own WTFs. Many of the ones in Javascript are shared with Ruby, Python and other interpreted languages. They hardly bite anyone in a real project.

[smtf]

If by real you mean yours fine; however, your projects are not everyone's. If you'd like you could respond with specific cases you've used javascript for system or server level programming.