If they were to 'fix it' then they'd be the only weapon that has something like that. Yes, there are animated weapons, but it's a fixed animation. A blade unfolds, a flower opens, a lunchbox expands, but that's the extent of their animation. They don't have a constant, physics impacted animation. So the Ninja relic has tassels that don't move, that's a pretty minor thing that would have a reaching impact if addressed.