AR's have kinda been powercrept by smg's in high and low end pve/pvp. Everything an ar can do an smg can do better, maybe besides laning but at laning range you're gonna lose to a pulse.
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Because they are tuned poorly and they are just too hesitant to take any risks to see what would really end up being a good change or a bad one. The last risk they took was cranking up their damage and calling it a day for a season.
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Yep, bungie seems to not care about them or just not sure what to do with them. There are obviously exceptions to them not being good, but the vast majority are simply outclassed.