You can build an app that runs entirely in the browser eliminating the need to have a server and reducing latency. Of course it doesn't make sense for all use cases but for some apps it might make a lot of sense. For example that is how Liveview Desktop works.
I'm a big fan of LiveView, but when you get to a very high degree of interactivity or anything that needs to work well offline or with bad signal quality then LiveView is not the right choice.
