[notjosh]

I think it's probably related to issues that arise when performing view actions/animation in the RN equivalent of `-viewWillAppear:` while segue animations are playing. (Short version: it occurs because the RN JavaScript execution thread is asynchronous.)

A concrete example of a problem I had was when setting a text field to be first responder when displayed. The result was that the keyboard was trying to appear a split second after the push segue animation fired.

(IIRC you can reproduce it fairly trivially in a pure native app by calling `-becomeFirstResponder` asynchronously inside a `viewWillAppear:` block. The result was two animations fighting for screen layout, and a giant white empty block where the keyboard should be.)

The solutions were to: a) wait, or b) fire synchronously in `-viewWillAppear:`. Airbnb seem to have chosen a).