Yeah, that's why we clicked on the link.

A softball like 10% bigger isn't that interesting.

if that was the only difference. the fact the ball is designed to get softer the longer it is played makes it so hits at the start of a game are different than at the end. fielders would learn this and change tactics based on that. normally, when the ball goes flat during a game, it is replaced. that in and of itself made it interesting to me as a standout feature.