I don't see that there is a reason for it. If captain is delaying in response, then the other team finds this very useful as well.
Yes, our Radio Ops was getting irritated with the enemy Captain for taking a long time after calling "STOP" until I told him that I appreciated having the time to quietly converse with my First Mate and Engineering about what we would do after the pause ended. I found that to be a natural balancing factor for long pauses. Your mileage may vary!