Howdy, creator of django-unicorn here. Some of the UI-specific examples are a little contrived and wouldn't be what I consider a really great idea, but it's more to show the possibilities, i.e. instead of counting characters, you could do a heavy ML task to analyze the text.

Personally, I mostly use Unicorn as a component library to split up functionality from the view code, and as a way to persist data to the backend (which would already be an AJAX call) without the hassle of creating an API, dealing with serializers, etc.