Titan Potion

Nearly every boss ignores being shoved, so this does nothing at all in the fight most players drink it for. Where it earns its slot is crowds: invasion waves, the corridor under a mob farm, anything that wants to close on you and pile up. Extra shove buys distance, and distance is what keeps a melee character breathing.

The Wall of Flesh is the clear case. The mouths trailing it will otherwise ride your back down the tunnel, and pushing them off gives you room to keep firing. A weapon that already throws things across the screen gets more out of the buff than one with no knockback to begin with, which gains nothing at all.

Bones in the recipe mean this cannot be broken down in shimmer until you have cleared Skeletron, so it is not an early source of its ingredients. If you were planning to convert a stack of them, that gate comes first.