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Abuse it in what sense? Obviously there can't be bounty progress from custom games and if there's map exploits that are found, Bungie will sure as shit fix them.
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If you can not progress bounties or quests and just want to fight your friends that is okay with me.
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I agree 100% it shouldn't benefit character progression at all. The only major benefit would be to face better guardians and improve at PVP or to have a good time with friends. Clan battles too.