This part of the original article was referring to React Native. React != React Native, they are two separate projects. I realise that doesn't answer your ques

This part of the original article was referring to React Native. React != React Native, they are two separate projects. I realise that doesn't answer your question (which seems to be 'please justify React Native having a lot of open Github issues and being seemingly less stable than React') but it seems a bit misleading to conflate the two projects, and to expect the same amount of stability from each. React is a UI library. React Native comprises of a UI library, a JS <-> native binding system with wrappers for native APIs, a build system, and an implementation of CSS-like layout for native views. They are not really comparable.