Ask HN: Why isn't there a React Native browser yet?

In development mode, react native works like a glorified web browser but instead of web components it renders native components. Why isn't there a browser (and a server/package manager) which brings native to the web. Instead of a hardcoded IP for the package manager we have an address bar which fetches the react code and renders it. Is performance the concern? Or does HTML win because of smaller code footprint? What has stopped Facebook and/or others from building the native web.