...if they actually required headshots to be effective.
The problem is that many of them - EX: Thorn and The Last Word - don't, and they can just melt you with body shots that they rattle off in hip fire or chest shots that they rattle off hoping one is a headshot too. Even during the reign of the SUROS Regime and Auto Rifles, you still had to consistently drill people in the head to melt them; now Handcannons achieve the same thing but with much less effort.
And don't give me that "Oh, they're getting headshots though!" line. We all know they're not - especially when they're rattling off those panic fire shots at damn near AR speed or you're getting melted by Thorn DoT.
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New exotic handcannon.