The .40 was a solution without a problem. The 9mm was a EUROPEAN police round originally, which means it was intended to use to wound, not drop someone in their socks. Both, however, are great for use in small, deep-concealment pieces.
For frontline use, or in a cop's holster, the .45 is everything you need, and has been for 80+ years. Don't fix it if it ain't broke.
Can't disagree with that sentiment. I only raise the question if more capacity is the driving issue that caused the change to the inadequate 9mm. Our troops deserve better.