Note that on well serviced routes like SYD-MEL, Often High Status Frequent Flyers on flexible fares happily jump to an earlier flight when available, thereby making their prized front row seats available.

These become visible and available for selection by the unwashed masses who are now being encouraged to use quick check. Previously, most would have simply been given their seat that was preallocated; they can now 'see' more options and are making choices.