Quite a few comments seem to imply Messenger was written in React Native, so I want to clarify this is not true. Messenger was a fully native app before the rewrite, too!

RN isn’t the right tradeoff for Messenger — whose new core is written in plain C — but its use at FB in general is growing, with 750+ screens in RN. So the rumours of its death are greatly exaggerated.

I think it’s great to have different options with different tradeoffs available to choose from. But hey, that’s just me.