DistantRumble
It has been said many times before, but I'll say it again just on the off-chance that the message gets home.
A flight may have a slot issued by Eurocontrol but that can change at a moments notice. The message can come suddenly to say your slot is 10 mins from now. In this case you must be ready to push back, start engines and GO - no delay. If you miss this new slot you could face hours of further delays.
Therefore the only place to be is on the aircraft, doors closed with tug attached and wait. There is no time to load any pax after the improvement has been received which is why we put you on board and close the gate. We don't do this for fun.
Don't tell me it works both ways.......because it does not!