You want reasons? Well here's Bungies reason: "Gjallarhorn users only want Gjallarhorn users. We don't want the community to be alienated because they think it's what they need to get through something tough" sounds to me like the Gjallarhorn users caused your own NERF. It's a fact! It's in the patch! And now you just got slapped!
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No it's not! If some people are piece of shit not all the people are piece of shit!
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Bungie said Gjallarhorn users are alienating the community because they don't have Gjallarhorn it's not what they wanted. So they're bringing other launchers to par with it. By slapping you in the face and NERFING it.