Is there a reason why such AIs can’t offload to stockfish? To me the max power of AI could be achieved when it knows when to hand off to a better tool - is it

Is there a reason why such AIs can’t offload to stockfish? To me the max power of AI could be achieved when it knows when to hand off to a better tool - is it a matter of ChatGPT not knowing what doesn’t know or simply the devs haven’t integrated with other tools (yet)?