> React Native already requires Babel.

Could you elaborate on that please? Is it impossible to skip Babel when using React Native?

> Not at all. Installation is very fast and easy.

(Last time I checked Flow npm package gives you binaries.)

I'm sure Flow installs fine in "standard" environments, like an OSX laptop. I was thinking about more weird places, like CI servers where you can't fully control the environment. I was burned enough about stuff like that in the past.