Without a more complex example that shows the 'real' benefit, that would just be another unsubstantiated claim.
I know I'm setting a tough bar, but Backbone (and most frameworks) ask for a lot of faith. I've seen far too many "Framework X will make everything easier; all you have to do is totally commit yourself to it until switching to something else is not a feasible option" claims, almost always followed (eventually) by "Yeah, sorry, we really thought it would work out."
In contrast, libraries like jQuery say "Hey, you don't need us, but if you want to do X you can use us to do Y, which is simpler." They don't require a huge commitment up-front; you can start to use them gradually and let them prove their worth. I think that's why jQuery and many library-type products have been so successful compared to the framework-type products.