I would call "can only use Jupyter notebooks" very bad at programming, not merely "not too bad". It's well below expectation in my opinion. Whether you choose

I would call "can only use Jupyter notebooks" very bad at programming, not merely "not too bad". It's well below expectation in my opinion. Whether you choose to call it "good" or "not too bad", there is a minimum bar of competence that data scientists need to meet in statistics/ML/AI, programming, and their domain of application. And the ability to move from Jupyter notebooks to Python modules/packages is a basic.