I don't think the visual approach does much for interactions, so that's a separate concern. This is more about feel. E.g. inertia applied to CoG, so when you grab it outside CoG, large files will tilt more as you drag. Light files would probably start spinning even.

Now, applying inertia for the movement itself would be annoying. Please don't do that. :)

You talk about interactions. In my mind the useful part is the added information density which comes easy (we are good at judging object sizes visually, not by numbers). I also want this information before interacting with the files. The value is knowing in advance, at a glance, what you're dealing with.

When you mention CoG, spinning etc. it becomes game-like — not something I would want in a productivity focused interface. But if you're developing a game or a toy experiment, go for it.

Thats the micro interaction that needs to be explored with iteration. The taptic engine pressure response (IMO) is not the best , but applying some heuristic ux designs I think we can approximate CoG and inertia.