Well, someone probably said the same about Go or React-Native when they first came out too. We have to start somewhere...
RN came from a giant company that uses it in its core product. Big difference.
cf https://talks.golang.org/2012/splash.article
(Agree with parent but not wanting Go to be left out of the "giant company" bucket.)
The framework is a nice idea, and will definitely help into diversifying some of the mobile frontend stuff.
On the other hand you can't compare RN to this framework.
As the person you commented on, facebook has been using RN on its main products like instagram, so it has proven that the framework can be placed on production ready apps with a massive userbase.
Yeah the kids nowadays are terrible.
Large codebases have never been particularly welcoming to newcomers.