Being a "black box" is good. I don't have any expertise with React in particular, but any complex enough framework will break down when you extend it beyond the

Being a "black box" is good. I don't have any expertise with React in particular, but any complex enough framework will break down when you extend it beyond the official documented APIs and start relying on undocumented behaviour. Nobody guarantees it will work after the next version bump. I'm speaking from past experience with Django. Years ago I naïvely made the mistake of assuming that clean, readable source code in the framework implies a contract between the API author and user.