And an answer to your question:

I've seen lots of different kinds of good groups; while I agree that a couple different kinds of characters are generally sub-optimal for levelling, I honestly think 80% of it is more about picking the levelling location that fits your group. There's places I'd go with a character with detect hidden or acute vision that I wouldn't go without. There's places I go if there's a lot of healing/support in my group (which, good though it is, comes at an opportunity cost, usually in the damage department) and different places I go if I've got a group full of high offense low defense low support characters like orcs and A-Ps.

That being said...

One of these quests being introduced at this point gives incentives for characters who might otherwise be disinclined to level in its chosen hunting area, and not so much to characters who would be inclined to level there otherwise. So, sort of, but not exactly in the way I think you mean at this point.