The ‘Adventuring in the dragon Isles’ quest in the guide is marked as (optional) for a reason, currently blizzard is not issuing this quest, I believe later on this will be applied. However, currently the guides are optimized accordingly for max exp and unlock dragon riding mounts per zone. If for what ever reason you are not 70 by the end of the guides, don’t worry, there are dailies and expedition quests to do along with world quests, doing them, you’ll be 70 in no time.