Not allways,
in my questing test profile i added a quest-Detail for grinding 200 Mobs, just to get a level up for sure. The 200 are not belonging to the quest, just for grinding purpose

Of Course i need 12 of them, but 188 more -> level up complete. Not the best way and grinding areas are ncie, but if i'm there for the quest, i just make it to kill a little bit more then needed.....
If it will be implemented, please with an option to not use it ;-)