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The Milky Way Galaxy isn't in the center of that map for any philosophical reason; it's only in the center of the map because that's our only point of reference. On any map, your point of reference -- whether it be a city, state, country, continent, or our Sun on a map of our solar system -- is put in the center, as a place to start mapping from.
(But I think they know that but they have to go with that model because its all we have.)