One of the best examples of the need for a concise conference between officials is the onside kick, when the kicked ball is touched, then loose, then recovered, all the while there is blocking going on all around. No ONE official can rule on all aspects of this action. One needs to be able to report WHO first touched the ball and WHERE that touching occurred. That can affect the legality of blocking by Team A. Perhaps a flag was thrown for an APPARENT illegal block by A, but, during the discussion, the covering official reports that the ball was first touched by B before it had reached B's restraining line. The official calling the foul knows that the block occurred after the ball was first touched, but couldn't know who first touched the ball, or exactly where. After all the facts are known, the block by A is determined to be legal, and the flag is waved off.
That takes a discussion, and takes a few moments. But, with that, we get it right, and the world continues to spin on its normal axis.
Robert