Even in smaller guilds, if everyone tried to do all the obvious work on raids, that work would take more work and it might even be undone. Can't have everyone leading. There comes a point when too much of a good thing is bad. Too many cooks in the kitchen, so to speak. Pullers stepping on each others' toes. Kiters crossing streams, aggro bouncing all over. Tanks can wait in the wings for adds or if the MA goes down, but otherwise they're DPS.
The same goes for group content. Typically, one puller, one tank, one or more CC. Heal/support roles and especially DPS can be legion. One player can fulfill multiple active roles, but usually not the other way around. As a result, most of the group stays in camp, similar to the raid force. If the puller dies, rogue suddenly takes lead and drags the corpse. If a train overtakes the group, ench/bard mezzes or dru/wiz evacs. The leadership role changes as the situation does, with each class having an opportunity to shine.
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