Their reasoning for nerf, and why they actually will be nerfing Ghorn are two different things. Lfg was just something they could cite, that a portion of players could relate to. The nerf coming is due to us making short work of the "hardest" content they can throw at us. If you use lfg to try and jump in at specific checkpoints, expect the guy with said checkpoint to pick and choose who to play with. It wouldn't be an issue if folks formed their own fireteams, or joined a clan. If it is your fireteam, you get to do the screening.