There's a lot of children in the world, and Santa is busy in his workshop, so he can't ask them all what they want, so there's lots of local Santas to handle the queues of children, and listen to what they want, and lots of elves to check who's been naughty and nice, and lots of other elves that build the wooden toys.
Each one only needs to worry about the children assigned to them. Eventually all the information will get back to the North Pole. And it doesn't matter when, or what order, so long as it gets there before Christmas Eve.
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