I agree that in and of itself, it's perhaps not extremely useful in the modern world. However, training up to that level will have benefits in terms of bone den

I agree that in and of itself, it's perhaps not extremely useful in the modern world. However, training up to that level will have benefits in terms of bone density and core strength. It's not clear what you would gain by learning to spin a ball like that. Improved hand-eye coordination, maybe?