Carnival Cruise Line is asking guests not to try to reach out to individual maître d's for dining arrangements, but why not?

Should cruise diners let wait staff know if they won't be in the dining room? Carnival responds over attendance.

Carnival restaurants available fleetwide Coffee Bar or JavaBlue Cafe A la carte pricing; snacks Black coffee and tea are free at the buffet and in the main dining room, but you'll want to come ...