Or could it be that he has a valid point. Flybe will have to purchase a push back tug and bars and training will be required for the ground staff to do the pusback, also more staff involved - driver, comms guy and at least one wingman, maybe two as the stands will be close together.
Also, there will be more congestion at peak times, for example, 3 a/c are all due out at 0700. I'm sure there will be delays while you wait for the one that has pushed to complete his checks and taxi away.