Doing the massive group fates is HORRIBLE at the moment as a healer, because currently, it appears the game chooses who to render randomly, making it so you can't even target party members to heal/rez them when needed.

Please change the rendering order of models to load your own character, then party members, then mobs, and THEN random people standing around that aren't part of your party at all and that no one actually cares about. It shouldn't be literally impossible for a player to fill their role, just because a bunch of people are standing nearby.