I have always been taught that you did not expose the inside of the wrist, that the bone blocked the attack. For the purpose above in the case of a knife or sword, but also because there is more strength blocking with bone than skin and in this position the two forearm bones are aligned to provide additional strength to the block.
I have trained with Kancho Matsui on several ocasions, but I can't say that I recall how he did this block, one way or the other. Now I will have to pay attention should I have another opportunity.
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