>>106939432Again, this would not change what parts of the model can or can't jiggle. In fact, you have to go out of your way to disable physics on specific parts.
If I were to pick Haku and put every single available animation on her one after another, her tits would jiggle for (almost) all of them. If I were to modify her model to add physics to her ass, it would jiggle on all of those animations as well. If I were to modify it further and add physics to her arms, thighs and belly, they would also jiggle on every animation.
This is really obvious shit when you just look at every model's hair. There are no universal standards for those and they don't need to follow any, but they behave the exact same way for every animation no matter whether it's just a few bouncing strands or a waterfall of floor-length hair. There's nothing stopping a Laplus model from using an animation made for Luka or Coco model from using an animation made for Miku.