I'm honestly just not quite sure what they were thinking. The arms do exactly two impressive things. First, it's cool when they act as the nozzle of the magic lamp during Arabian Nights. Second, it's neat when they expel a rapid stream of fireworks after the narration in the finale. That's it, and it feels like similar effects could've been achieved differently. Otherwise, they just flail. I have to imagine that without the arms, they could've made everything much less bulky and navigated it through the drawbridge more easily.