What if LLMs get 'a mental model of requirements/code behavior'? LLMs may have experts in it, each with its own specialty. You can even combine several LLMs, each doing its own thing: one creates architecture, another writes documentation, a third critiques, a fourth writes code, a fifth creates and updates the "mental model," etc.

I agree with the PM role, but with such low requirements that anyone can do it.

and each LLM can invent some ridiculous suprise. Who is going to check if it did right thing?