The AI researcher can improve the AI system. As in make chatgpt run on a 2015 version smartwatch.

But that will not add novel chemotherapy regiments to the clinical practice of the healthbot.

Humans are constantly learning and observing. The AI systems we use today generalize based on a gathered dataset. Teach an AI what is right today but wrong tomorrow and it will keep being wrong until fine tuned again. There are degrees of flexibility and innovation we still haven't captured with AI