I wish there was OMM as it would be a great time saver for people with limited gaming time. Notwithstanding, Bungie has answered this many times and in many places since launch. There are two core reasons behind no OMM decision; 1) OMM results in too much poor behaviour that ultimately defeats it's purpose - eg AFK and griefing ; and 2) OMM undermines Clan formation weakening Community fabric and lowering participation rates as folks have less and less clan mates with which to complete team based end game content. While it hasn't specifically been disclosed, you gain a clear understanding from a number of interviews that Bungie execs harken back to the sense of Community that grew during the LAN party days of the pre-networked console era. They are clearly trying to reignite this dynamic but don't understand the best way to do so. Unfortunately despite the fact that; 3) both reasons have been proven wrong; and 4) Over 80% of the Community wants OMM (see numerous surveys here, podcasts, stream, Twitter etc) Bungie are doggedly listening to their well meaning but misguided advisors and not their loyal and knowledgable customers. It's quite strange really ....... [b][u]PS[/u][/b] : as to who is making these decisions Bungie won't tell as to do so would almost certainly lead to a public "lynching". However it's most likely to be the supported by the lead PvE dev and his boss Jason Jones.