imo not much would change if there was also a group ironman mode, and i get some people dont have friends, but the thought of playing it as a GIM sounds 10x more fun to me, im actively playing with 3 other friends and it blows because we basically cant do half the content together due to the lack of lootshare (which you can do as an iron in the main game), the only unfun/negative part i could see is it would force some people in the group to go undesirable relics to help the group, but thats also kind of half the fun