I think it is worse than that. For soem reason, Disney has decided that the phone CM's do not need to be as informed and as connected to the "World" as they should be. I spent years in QA in a large call center that took work outsourced from other companies, and we were able to keep our reps informed and up to date. How this global company cannot figure that if they put just a little more effort into their call centers they would save a boatload of money is beyond me. First call resolution is a key factor for metrics in every call center I know, yet DIsney actually encourages multiple calls from the same person for the same reason simply so the caller can confirm that the information is correct, Never mind the calls that take place when the caller has a concern that entails reaching a person at their resort.
As to having the front dest folks assisting guests at teh desk, I woudl much prefer to give them the ability to address calls from guest, and resolve problems before those guests arrive at the desk mad as heck and frustrated beyond belief. Either way, they get to address the guest issue, so I woudl think it is preferable to address it at the fist call, solve the problem and let the guest move on with the vacation. Seems to me that it is a higher level of customer service that allows everyone to have a magical day.