Anyone else not understand why they added new projectiles to Roadhog’s primary fire?

The small pellets deal 100 damage in a wide spread and the big pellets deal 60 damage in a narrow spread. But what’s the point of having big pellets? Why not just use small pellets for both? As in, 100 damage of small pellets in a wide spread, 60 damage of small pellets in a narrow spread. It just looks weird and janky.