Reducing the uncertainty does not give you an edge vs having certainty a priori though. For instance, you are not better off discovering that the urn has a 50:

Reducing the uncertainty does not give you an edge vs having certainty a priori though. For instance, you are not better off discovering that the urn has a 50:50 ratio than you would be if you knew that 50:50 ratio ahead of time. If you're saying that you could discover a better ratio, then the thing that gives you the edge is the better ratio itself; if you knew the better ratio ahead of time, the epistemic uncertainty would only harm you.