I believe you're thinking unstable as in "it breaks all the time". That's not it; it's that anything written before React Hooks were introduced is now squarely

I believe you're thinking unstable as in "it breaks all the time". That's not it; it's that anything written before React Hooks were introduced is now squarely in the category of legacy code (https://react.dev/reference/react/legacy https://react.dev/reference/react/legacy).