> What you don't want is to interview for a React job with only a cursory/tutorial knowledge of it, and try to fall back to "well I'm an expert at 10 other languages, it's all easy"

Of course I would expect someone who claimed professional experience with React to have more than "a cursory/tutorial knowledge of it". In the post that started this chain, though, you said

> Decades of experience in C/Java is not going to work at a React shop. Either learn (and be opinionated about!) frameworks built in the last 5 years, or stick to somewhere within your expertise

I take that (in combination with the above) to mean that you somehow need to get a job where you can use React in order to get a job where you use React. I'm not sure what the point of that advice is, then. Perhaps I'm misunderstanding something here.