Depends on how you look at it. There was a little more RNG before. Before, I think you had a 20% chance for a mob to respawn with the icon, and a 4-16% chance (after that) of the mob to drop the ball. Now the mobs have a 0.5% chance to respawn with the icon, and if they have the icon they always drop a ball. The event is also 24/7, so it's more available to players on their time, so it ends up being more dragon balls.
Alrighty, thank you !