It's both distracting to the enemy and so big it could crush them so it seem like a superb weapon to have.
Stupid still, but superb.
Pros > Zelda's probably heavy enough to inflict some decent damage. > Easier to protect her this way. > By far the most photogenic weapon in Hyrule.
Cons > Getting hit with a big soft booty probably feels like getting hit with a pillow. > Draws massive aggro, everyone wants to get smacked in the face by royal booty. > Royal weapons have shite durability. > Link is absolutely sleeping on the couch tonight.