I'd wager GPT-6 would not depend on high-quality prompts, although it might still be good to get a trained person to enter information and do a sanity check.
But the core problem still exists based on the clarity of the prompt and the prompter.
Seeing my wife's depth of intuition and expertise as a physician, compared to my comparatively caveman-like prompts when asking for health advice, there's a massive delta in accuracy.
Have you ever had a significant health issue and tried to get help from a model? Even something like GPT 6 Pro? The firehose and confusion you will generate trying to figure out answers are far less helpful than having directed interaction with a physician.
The issue is that the AI is at best what's in papers and medical records, which often forgoes the core thing that might lead a physician to uncover something or take a different approach with the patient.