Luna disagreed heavily... she wasn't quite as fond as interacting with them as her sister was. They tended to hiss at her little too much. And the last time they tried to offload the task, it went quite interestingly. In a proper disaster to laugh at, way. Celestia wasn't entirely aware that the Swans only generally listened to her, and the Swanifying committee. Actually, they don't even listen... they take suggestions. Those outside of familiar faces... not in for a good time.