Well, as reactionaries love to tell us, it's a library and not a framework.
Great, we already have a library for that - it's called the DOM.
Don't get me wrong, I'm all for reactive programming, and even templated views. But reacts approach of hiding everything under the rug rather than having a clear "here's where the state changes" and "Here's we we render" divide always struck me as the worst of both worlds.