I hated that at first, but it's really hardly a problem when it comes to actual development. And it's pretty nice for optimization to be able to mix/control wh

I hated that at first, but it's really hardly a problem when it comes to actual development. And it's pretty nice for optimization to be able to mix/control what properties on a model actually need the notification changes, as opposed to other frameworks that just assume everything notifies. (Especially useful when you start dealing with object graphs with 100s of properties).