I played Planetside 2 for eight years, and that game could have fights involving two, three or even four hundred people in a relatively small area. Generally they tend to break up into smaller-scale conflicts within that area (one group will attempt to take and hold a building, another will go for a capture point, etc.) and that's where support becomes critical. Just one person pulling clutch revives or keeping ammo topped off can make a difference.I dunno how effect support roles can be in a 128-player game. Overwatch works well because the teams are very small, but on such a massive scale I find it hard to grasp how a support can have any real impact on such a huge clusterfuck.