And they can also branch out instead of wondering 'what if we didn't make React Native rely on JavaScript and instead just used Objective-C?'. Both approaches will have differing strengths and weaknesses and both teams (and hopefully future teams of new projects elsewhere) will have more knowledge and experience to learn from.

I think it’s quite amazing what Facebook/Instagram are doing. They are creating a legacy that will hopefully inform what Apple and Google do with their frameworks too.