It seems like a way to try to calculate and thereby eliminate risk, would be an overall beneficial thing. But then it also seems to make insurance less effective overall.
Let's not think about big "evil" insurance companies for a moment. Say there are 10 Amish guys who want to form a risk pool to provide emergency health care for their families. They were just about to finalize the contract when one of them proposes that they take a medical exam beforehand. It transpires that one of them has lung cancer. Why would the other nine allow the poor guy to partake in their risk pooling?
If you eliminate risk you also eliminate the need for insurance. This seems like a good thing. But then you also leave a bunch of people helpless.
It's an interesting ethical question.