Arbalest was put in the kinetic slot because that’s essentially its exotic bonus (its exotic perk became useless when champions came out with no sheilds)
Its im the same situation as No Land Beyond in D1
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Except it isn't. No Land Beyond used Primary ammo.
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No land beyond was a kinetic sniper and the only of its kind just like how arbalest is the only kinetic of its kind and behaves like a sniper it even has a close range sight like no land
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Except Arbalest uses Special ammo but I see your point.