I mean this kind of makes sense, even if you’re not having them mid bounce point in different directions boobs react differently depending on how they’re being supported by what’s being worn so it would make sense you’d want Black Widow in her spy uniform to have em high and firm while your custom gooner Black Widow in a her lacey nightgown sitting on Iron Man’s lap would have em loose ‘n floopy…
BUT having messed with Phicen style bodies, I thought they sounded fun “seamless bodies?! A metal skeleton encased in silicone for a life like look?!?! Could this be the future?!?! Narrator: it wasn’t. Look, boob physics was the least of their problems, this is like you’re trapped in the dinning room on the Titanic and as it’s slowly filling with water the waiter says “good news! The chef figured out how to get rid of that weird after taste in the sugar free jello!”
They have a poor range of movement (single joints that can’t go past 90) and where the skeleton flexes doesn’t look like natural flesh movement (elbows and knees kinda just fold and bubble out instead of constrict and pull like real muscle), they stain like no one’s business just looking at fabric that isn’t properly treated and the silicone skin soaks it , and the metal skeletons LOVE to just rip on out of their silicone prisons!
So yeah, boobs you can pose boucing or simulate push-up bra or free dangling physics… fun, but not the issue that needed addressing.