It's not clear to me why this is true. If LLMs are writing code, why are developers simply not orchestrating the completion of more features instead of moving up the stack to do product development work? Is there some implication that the existence of LLMs also enables developers to run user studies, evaluate business metrics and decide on strategy?
Additionally, if PMs can use LLMs to increase velocity in their work why not focus on all the things that used to be deprioritized? Why, with the freed up time, is generating code the best outcome?
These questions likely have different answers depending on organization size but I'm not sure I understand why orgs wouldn't just do more work in this scenario instead of blending responsibilities. It's not like there's infinite mental bandwidth just because an LLM is generating the code