Until medical models can contrive of unique diagnosis, this will not be true and cannot be true.

Medical models can absolutely get better at recognizing the patterns of diagnosis that doctors have already been diagnosing - which means they will also amplify misdiagnosis that aren't corrected for via cohort average. This is easy to see a large problem with: you end up with a pseudo-eugenics medical system that can't help people who aren't experiencing a "standard" problem.

The pitfall you describe is not inconsistent with exceeding human performance by most metrics.

I'd argue that the current system in the west already exhibits this problem to some extent. Fortunately it's a systemic issue as opposed to a technical one so there's no reason AI necessarily has to make it worse.