That would make them totally useless everywhere. Every bolt has to hit for it to kill like a shotty and it's pelts do in pvp or your target still lives with a sliver of health. With the spread of the projectiles there is very little chance to get a precision hit from range since fusions don't give precision bonus, so you'd be up close and personal where a shotgun would work even better anyways. Fusions were meant to be the counter to shotguns but nerfs and poor map design has made them obsolete.
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Fusion rifles could OHKO from way further than any shotgun could before the nerf. You definitely didn't need the entire spread to hit either. You used to hear those things reving and pre-firing all the time, because why use any other gun? Just make the burst shoot more like a bolt than a wave and reward precision. Like if the Mythoclast had a larger cone and shot one charged round at a time instead of many like an auto rifle.