Allard

Because it would be redundant. They have the pump-action shotty fill the "kiss range enemy eraser" spot, while the "mid-range workhorse" spot is taken by the assault rifle.

People compare this shotty to the ones in DOOM 1 and 2, but it's not it. The DOOM 1-2 single shotty is a mid-range workhorse, but in D3 that slot is occupied by the trusty machine gun, while the shotty is a close-range enemy eraser. So if you're in the kissing distance, it does exactly what it's supposed to.

Unironically this, Q1 and 2 on Steam are notoriously bad, and they need console versions as well.