Originally Posted by kodiakpb
You still need to shoot and become proficient. Centered sights in the hands of someone who is not proficient will not result in POA/POI due to improper grip, trigger discipline, and/or sight picture.
I don't think this was a question of proficiency, although you are correct. Still, POA should be POI for the gun in its users hands. Based on what you wrote, your proficiency is meaningless if the sights are off. Ideally the gun needs to shoot to POA, then the user needs to become proficient enough to get the POI he wants during a stressful situation.
We can argue proficency requirements but the bottom line is that after changing sights, the POI needs to be verified and adjusted so that POA=POI.