https://news.ycombinator.com/item?id=20413046
Other article talking about it:
https://blog.appfigures.com/microsoft-goes-all-in-on-react-n...
Xamarin for .NET devs, React Native for C++ devs (a bit like QML/Qt).
Office naturally fits the C++ devs way.
But the Office team is also a right tool for each job group and has both Xamarin and React Native apps and telling the difference between them is getting tougher to do. You can already integrate React Native components inside a Xamarin app and vice versa because they each can look like native components to each other, and it's not entirely an either/or decision.