It's not React. It's React Native. React Native and React are about as similar as JavaScript and Java.
React Native is a way of orchestrating a UI comprised of native controls.
React Native is a way of orchestrating a UI comprised of native controls.
In retrospect, calling it React probably caused more problems than it brought benefits, and makes little sense - like Java vs JavaScript.
The team that killed C++/CX, said it isn't their problem that there aren't Visual Studio integrations like C++/CX, and eventually left C++/WinRT in maintenance and nowadays is responsible for windows-rs repo. Better not expect too much from that repo as well.
Welcome to Microsoft politics.