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I'd guess it's towards normalization of data. For instance, look at C_Map.GetMapLinksForMap, it returns the same 2D vector table but as a field of a subtable in a collection of tables. In that case, multiple returns don't help, but containing them in a table keeps the data consistent. Vector 2D is likely the most contentious given that it is just two fields, but it scales better the more fields the type contains.
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