It would be morally bankrupt to rely entirely on a quantitative test for something that is qualitative, I don't know how much clearer with the previous comment I can get?
You're missing the fact that any time someone takes a drug, they're essentially testing it against their unique body chemistry. The same as self-driving cars in unique situations.
The only difference is the car feedback loop is way better instrumented, and doesn't have to rely on mass statistics to inform recalls.
