Has there been any explanation or reasoning on why you cannot queue for a dungeon while using your chocobo?

As a dps, the queue times are long enough that most would like to go do something while waiting. For some of us leveling that would include questing which seems to be a great opportunity to use your chocobo. I would love it if I could queue for a dungeon, quest with my chocobo, then have the chocobo automatically dismiss when the queue pops (or have a pop up telling me to dismiss). There really seems no reason NOT to allow this and it seems like something most MMORPGs would have solved as an unnecessary limitation.