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I know absolutely nothing about neuroscience. When I read a claim about handwriting notes having more brain activity than typing notes, it seems like additional.. overhead (pun).. to accomplish the same task: memorization. Less brain activity to accomplish the same task of memorization would imply efficiency, wouldn't it?

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I think you're mixing efficiency with effectiveness. It may be more efficient to store your valuables in a breadbasket, but more effective to store them in a safety deposit box, if you measure effectiveness by "keeping everything in one place, free from the view of strangers". In this case, the extra effort aids (so it is claimed, I believe it but am no expert) on later retrieval, not in efficient intake.

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