Chasing druffulo and golden hallas back as the leader of the Inquisition is filler quest. Side quest there just for the sake of being there to fill the world with content.
MMOs is known for having filler content or fetch quest so it isnt a surprise that DAI has them as well.
Lets chase some more Halla!!
Questions to ask yourself:
1) Do you want the Dalish elves' assistance?
2) Do you want to recruit the Dalish Elf agent?
3) Do you empathize with the Dalish Elf camp's plight?
You are doing favors to gain their trust. They range from simple halla herding to tomb raiding for lost and ancient Dalish history.
There are ulterior motives to assisting the elves. They are not done simply for some gold and experience.
Helping them makes them trust you. When they trust you, they cooperate. Their cooperation provides you with rewards, as well as the satisfaction of helping Dalish.
MMOs generally have quests that are there to simply provide levels and story with no actual relevance to an overarching plot.
In fact, it's arguable that this doesn't even really apply to popular MMOs as even WoW has gone towards a more narrative storyline when it comes to leveling by quests. Their current equivalent of filler is "bonus objectives" which do exactly what you claim Inquisition does.
If you honestly find that spreading the Inquistion's influence and recruiting allies for the war effort is filler, then there's not much else that I can say.
P.S. The drufallo escort is meant as a tongue-in-cheek subtle humor towards drufallo's indestructible nature (it was a BioDev meme) as the expected escort path coincides with a high level rift which you can close by using the near-immortal drufallo as a tank.