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?

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?

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

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