I mean, do you realize that most of the big names on that list have a hybrid solution where they prove concepts, A/B test, and rapidly iterate-on/release new features using React Native, and then they have a native dev team for each platform that goes back and re-implements most of the core features natively?

None of those are apps that I'd hold up as paragons of UI design…

Facebook app also has huge chunks of platform-native code, it's why they also have things like Litho: https://fblitho.com/

And according to their announcement post Litho is what they are using for their News Feed: https://code.facebook.com/posts/1187475984695956/open-sourci...

So the most critical part of the Facebook app isn't in React Native. How much of those other apps are actually using React Native?

they are the most popular because they are needed to access a service. But they are all a fucking pain to use.