It seems the entire blog post is based on a misunderstanding of React Native's goals. I don't think the point of React Native has anything to do with building

It seems the entire blog post is based on a misunderstanding of React Native's goals. I don't think the point of React Native has anything to do with building a common UI across different platforms. In fact, they admit you'll need to build the UI separately for each platform. They're basically just exposing native components for manipulation in a React-like way, so beyond having an opportunity to make the UI in a platform specific way, there's actually an obligation to do so.