Presumably this will be followed up with react-native-win? Microsoft is all about cross platform when they're loosing.
Isn't this being too harsh on them? Personally I think they're doing better than ever compared to the entire last decade of fuckup. Also MS has always been about cross platform (Maybe you disagree because you think MS is one of the platforms, but in reality the main reason MS succeeded originally was because they were cross platform--supporting all kinds of computers instead of trying to dominate full stack like Apple did)
If I come across as anti-Microsoft, it's more that I think the US needs better anti-Monopoly laws. That's something we're still screwing up.