PVE Party Size Limits
Get a warrior in your guild → Drop a banner → Pick up the banner → Everyone follows the banner.
5x Warrior, 5x Ranger, 4x Elementalist, 4x Engineer,
4x Necromancer, 3x Mesmer, 4x Guardian, 4x Thief, 4 Revenant
4x Necromancer, 3x Mesmer, 4x Guardian, 4x Thief, 4 Revenant
That would be a legitimate use for the commander icon in PvE. Though with the current state you would probably gather up half the zone as well.
There really does need to be an extended party system. Squads are too expensive to obtain and doesn’t really cut it anyway.