And I don't think this is a knock against it. React Native is mainly an effort-multiplier, and Facebook has plenty of resources to do 2x the work (or 1.5x or whatever it is in practice)
And it's not just an effort multiplier, it also provides a unified codebase on both platforms which helps to provide a more consistent UX and less bugs.
Sure, and the single biggest weakness over at Mozilla is that they're more focused on building a better Chrome (a.k.a. following the leader) instead of innovating or fixing bugs. That's why we've lost useful tools like the 3D DOM rendering in favor of a fucking chat client in Thunderbird. Or why if your system is lagged enough you can hit Cmd+T, start typing a URL, hit return, and have Firefox load the new URL in the old tab… but at least we have that awful search instead of separate, proper, URL and search bars. It's why we get limited-time-only!!! paid themes while all extensions get disabled because someone forgot to deal with an expired certificate.
Mozilla, and by extension the Firefox crew, lost sight of their core competencies a long time ago. Every dumbass design decision the Chrome folks make, Mozilla will emulate a few years later.
I generally prefer react native apps (note that this is not the same as react which is more of a web framework) over Flutter. Because Flutter fakes native UI elements instead of just calling them.