It is impossible to officiate a perfect game due to human error. Officials may be lampooned by the fans and rated average by the coaches, and yet still receive a good evaluation by their observer. This is because how the officials performed, is always distorted by the perspective of the viewer.
The other reason is that each game is completely different, and it is not possible to predict what will happen. As the saying goes; “that’s why we play the game.”
But what would happen if a crew worked a game to perfection?