Because it has data binding. You only write your template once, you don't have to think about two separate paths: creation and update. With backbone, you eithe

Because it has data binding. You only write your template once, you don't have to think about two separate paths: creation and update. With backbone, you either did that and had performance issues or did updates separately, which is a pain to maintain. Also, in backbone, parent<->child communication is a complete after thought.