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The technical reason why an addon cannot do this is because the blips on the minimap are rendered as part of the minimap image by the game engine, and the UI -- even Blizzard's UI -- has no way to get information about them, any more than the UI could tell you what the average color of the minimap is, or how many blips are on it, etc. Basically, the minimap is a special kind of frame, and is unique, just like the WorldFrame, which is the frame in which the game world is rendered.
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