You could reconcile the class order hall problem by just playing 5 of your favorite classes / specs. Sure, they're all different but you probably want to experience their class hall stuff firsthand and see the many variations. That's my justification anyway.

Any secondary teams like gatherers should be all the same class. Because it's just a nuisance beyond the first go.

Outside of the class order hall it's business as usual. Dungeon quests, group quests, solo-but-party, etc.