If you own a Gally only play with other Gally owners. That way all the people who wanted the nerf but at the same time always want your help can't get it.
Edit 1: In my experiences most of the people starting groups saying you must have a ghorn are looking for help not elitist. It's people who can't play the game asking for the help of the almighty rocket launcher that have caused the problem so let them do it on their own.
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Actually according to bungie, the players the required max gallys for people to join their raid groups are the reason it got nerfed. My buddy has one and kicks ass. Luckily he just brings me along as a package deal. I am a little salty that it got nerfed before I had the chance to use one on my characters. However, if you allow only those with a gally to join which was what got it nerfed in the first place; you are setting yourself up for a further nerf or a xur sale. That Gally is elusive and sexy and I wish it didn't get nerfed. My girlfriend plays and has the warlock on my account (which I'm not allowed to touch lol) and my buddies who come over to blaze I hand em my controller to play Destiny (some who die every 30 seconds) and over 300 hours in and no gally. To me a weapon that elusive and sexy needs no nerf. It is losing its exotic status being weakend. I'm now on my third tangent, I'm going to eat something I'm starving. I look forward to hate comments, get gud scrub comments, and the occasional I'm baggin your mom comments. If I get none... I won't feel like I'm on the Destiny forum's.