Originally Posted by WHBM

Aviation safety managers do not like this. If there is a deprssurisation at altitude and the need for a sudden diversion, the cabin crews have got better things to do than reseat those pax back to the exit row for the landing. The seat belt sign would be on throughout anyway. They should stay there all the time. In any event, the dispatcher should have caught this and sorted it out at the gate before boarding, not leave it to the crew on board. It would only be if the pax booked for the exit rows did not turn up that the cabin crew would need to do this.