Arc Soul kills count as ability kills so it guarantees an Ionic Trace if it taps the final blow. Other than that it's an increase in damage output to chain into your other abilities or perhaps a Voltshot weapon.
Have you tried rolling for a Voltshot scout rifle? You can get 4th Times / Voltshot and it's super good
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I chased down that scout basically centered my build around jolt to compensate for the weak rework hour one of this season and I am aware of the ionic traces as the fall under generic arc ability kills