Seems to me , just to make It seem like there are a lot of mods to farm up . a lesser form of loot to chase as the Exotics available is kind of lacking really . For a years worth of work it seems they concentrated far to much on eververse and season pass junk . Rather than new exotics to keep people playing .
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Exotic weapons aren't the only thing to keep people coming back. Eventually you'll get bored of it. Hell, all of the meta guns are usually legendaries with god-tier rolls.