Then again that also probably means falling behind on the exp curve at some point.
In my experience in the beta, it does not matter much. You get way more XP for completing quests and skill checks than killing and you level up the mythic class by milestones, it´s tied to the story, not your xp gained. It seems it could be different for the Mythic Legend path, that it is rumored to allow you to gain xp fastest so your "standard" class will go to up to level 30 or more. That said, you lose your mythic powers following that path.
