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I'm interested to blend two hierarchies, meaning that rather than creating duplicate hierarchies, and shapes on layers from the second design would be added into the same cell of the first design if it already existed. To "blend" this way would be distinctly different from adding de-duped cell names or merging with overwrite as there would be a minimal final hierarchy with no loss of data from either source.
If used ill advisedly it might result in duplicate shapes, but a classic example would be pulling back together a hierarchy in all layers from stream files each containing only subsets of layers. It could be implementing by blend option opening or importing, or a blend option when copying cells containing hierarchy.
Apologies if I missed something, if it's already been addressed?