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The difficulty in those kind of re-attachments is encouraging bloodflow into the reattached limbs. with all the arteries, capillaries etc severed, reattaching them can be an extremely tedious process, and it's not always guaranteed that it will take. If bloodflow is not restored within a certain amount of time, the tissue will die and reattaching is pointless. It can only be done within a certain time or the limbs are just gone.
But yeah, that is cool. It's when they can regenerate nerve tissue (which fish can do, which is a reason they are a subject of fascination for neurologists) that things will be VERY cool.
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