5. Doctors delegate everything to AI assistants because humans are lazy, especially if those AI assistants are correct some significant portion of the time

Then the claim may be that you don't need that many doctors anymore and that one doctor can do the job of X doctors in less time which has the economical effect that there is less demand for/supply of doctors, which then results in a home grown shortage of doctors, since less people are incentivized to become doctors...

Step 2 prevents that. It's not there by accident.

They need to write down their (initial) diagnosis before the AI answer is shown.

Step 2 doesn't prevent it, because of step 4. AI becomes "upon further testing/examination/review we conclude that..."

And then if the patient isn't cured or has an adverse reaction, the answer given by the doctor in step 2 is examined compared to the post-AI resolution.

If #2 is correct and #4 wrong, the doctor has to answer for stuff.