Justin D: the reason for pulling away from the gate is to be ready when air traffic control gives the "go." The crew may only be given a 10 minute window to take off. The update may be in 60 minutes but in 5 minutes that can change. Nothing is for sure. Nothing is written in stone. It takes too much time to deboard and reboard the passengers and the ground crew is probably busy with other delayed passengers in the terminal and really can't afford the time to stop what they are doing to add more passengers to the line inside. And then ATC will say "go" but everyone is inside. Indeed what a mess that is.
Other passengers get pretty mad when a select group get to go but their group can't. A human zoo to be sure.
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