They fly better. You can roll things on them, if you also have a flat platform. You can lay on one and use it as a back massager. It’ll retain heat the longest, so if you warm one up it’ll keep you warm longer through a cold night, or keep your soup warm or whatever. They look kinda cool. That’s probably the sturdiest shape for holding in your hand and using as a hammer, if you wanted to beat hides or hammer copper or something. If you had a lot of them, some sticks and a hillside, you could create an early version of plinko and use it to study probability and statistics without even having to invent numbers. Sports/games in general. You could paint faces and glue hair onto them and talk to them if you were Tom Hanks-tier lonely. Or for a religious observance. That is the most efficient, sturdy and uncomfortable portable chair you could make. You could stand on them and exercise your ankle muscles that way, improving balance as well. They’ll fall the most predictably, so you could sit in a tree and drop one on a rabbit as it hopped by.

Yeah, you could do a lot of things with a ball. Pretty easy to make, too. I myself enjoyed making them out of things like mud and playdough when I was a kid.