I think this is handled to a much smaller degree via Faction Leves.

You get storylines, cut scenes (sorta), and quest dependencies...

Just there are not that many, and they are 'expensive' to get to do (faction points are not easy to come bye).

If faction quests were extended (or there was Grand Company Leve Quests) to have more story lines and what nots, that would be great!

Then we could leave these simple grind levequests for those who just want to grind XP.