I know I'm a little late on this and with the upcoming weapon patch i feel like siderarms should be addressed. Sidearms are supposed to be special weapons that should be used between the range of a fusion rifle and a shotgun, but the accuracy is only good when your at shotgun range. So I have thought of some ways to make sidearms a more viable choice in Crucible and PvE.
Sidearms as a whole: Increase initial range and accuracy by 15%-20%
Dreg's Promise: Remove travel time or add tracking like in PvE but not as aggressive.
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I don't think anyone has ever said they are intended to be used between shotguns and fusions. They are just their for our use as, in fact, sidearms.