LLMs also can “understand things and apply their ability to formulate solutions”. There is nothing that will inherently limit AI from doing all knowledge work (and all physical work once robotics is good enough).

Of course developers could just move up the “next level of abstraction” and become managers of agents who write the code, but eventually AI becomes a better manager of agents than even the best humans, at which point there is no contribution a human can make that an AI model or system of models couldn’t do better.