I've been wondering the same thing. One of the contributing factors is definitely that everybody already knows it. We've been forced by years of web developme

I've been wondering the same thing. One of the contributing factors is definitely that everybody already knows it. We've been forced by years of web development to have an understanding of it, so being able to reuse that knowledge in a non-web context makes it interesting. Additionally, it's virgin ground. Most languages you'd use to build an application in (like java, C++, C#, etc.) have become quite bloated with huge default frameworks that everybody uses. Using JS for anything more advanced than a web page is relatively new, so there is a lot left there to discover and do your own way.