The Discord devs use RN and their app is anything but experimental or small. And there are by far not the only one (Skype, Instagram, Wix, UberEats, Tesla, Baidu, Salesforce).
Native devs don’t like RN because the mobile dev supply gets bigger which hurts their market value. That’s the real reason of your post, spreading FUD.
RN has its limitations but for 80% of apps it’s absolutely fine.