Because clearly certain weapon types are out of hand in case balancing while Auto Rifles consistently suck across the board in every activity aside of patrols.
Most people wouldn't even be using them if it weren't for champion stun perks/mods...
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Hand cannons have been almost completely useless and outclassed in PVE for a while now. Rather unfortunate really. Hell, most auto rifles are outclassed completely by SMGs. Hand cannons need a major buff and rework and autos def need to be enhanced as well.