In conversation about creating those shadows, which I am dimly recalling, the thing I remember most clearly is someone sharing a picture of the different types of Go stone by curvature radius and wondering which one to emulate. Along with noting the fact that black stones have a different curvature to white ones.
This kind of stuff:
The shape of the stones - #11 by yebellz
… so it definitely was taken into consideration. I can’t recall where that conversation was though - probably in a dev channel that has disappeared by now.