I didn’t read all of the replies so my comments may have already been made... but, as time passes and bullet performance enhances, there is still resistance to change. The FBI is going back to the 9mm based on performance updates - progress maybe? But they do want to stay on the cutting edge of modern ballistics. Now, many still carry a 230 fmj in a .45 which “will tear an arm off” if you believe the hype. Large bullets at moderate speeds or small bullets at high speeds? Rural LEO May have different objectives then city LEO. Stop a man? Stop a car? Shoot through glass? Stop a bear? The main problem is “we” are trying to do all of this with a handgun because a long gun is inconvenient to carry and only comes out of the trunk / rack if time permits.