And absolutely none of those situations are mutually exclusive either.
Remember the G map with Minerva? A rush map of merfolk, goblin archers/necromancers, and demons, including the scythe bastards with ranged attacks. You needed DPS, a few tanks/lightning rod blockers, and probably some luck with assassination. But ranged slots were spread out and you had three exits to block, so you needed to concentrate your DPS and use tanks or duelists with high block, or have a shitton of AOE on hand. Or use rogues/ninjas and hope for the best, but that's obviously not ideal.
Everyone used spread-out heavies to deal with the clusterfuck, but there's a situation that Nadia would've done much better than Gellius would have.