Large populations also in the technically rich countries simply do not have access to a doctor.
in Poland which has a free public Healthcare it takes literal years to get a single appointment sometimes.
We just minted the term "cognitive debt" for software engineers that cannot keep up with what the AI spits out. How would that apply to ER doctors, or any other kind of doctor?
In Europe, there are some rich cities which have on average one doctor per hundred people. And there are large areas in Eastern Europe that have ten times less than that.
If you have some unusual symptoms or a little pain somewhere and no access to doctors you will most likely ignore it.
If you can get any diagnosis it can help you e.g. decide to travel to get treatment.
And the locally available alternative for ai diagnosis is a doctor you can get to in few months, who works 80 hours a week and has 10 minutes per patient.
For ai to be valuable you really don't need to be better than average physician in top American clinic.
I fully agree that AI could extend access; but to build on what others have said too, lack of physical diagnostics is an issue as is the lack of physical tech infrastructure.