Eh, sure, if you only have one page and that's all you do on that page. Real world web applications are much more complicated with all sorts of states and neste

Eh, sure, if you only have one page and that's all you do on that page. Real world web applications are much more complicated with all sorts of states and nested components, and you would want encapsulation and a very good separation of the functionalities. But the blog article can only show you a simple example to illustrate the idea.