An anecdotal piece of evidence.

There’s this senior engineer, by name of Jafar Husain. Used to work at Microsoft, where he learned RxJS (from Matt Podwysocki, I shouldn’t wonder). Then he moved to Netflix and brought his RxJS know-how there. Worked there as a senior software engineer for about 7 years. Authored the Falcor library (a graphql competitor in the early days of graphql). Then, in October 2018, he joined Facebook.

And he is a very talented engineer :-)