The horde guide needs some serious work.
The Ishamuhale quest turn in is not listed until the Barrens 25-25 guide and by that time the quest is grey, offering no exp. The Harvester quest should be listed as optional as it has a ridiculous spawn time and it’s not solo friendly. In addition, a lot of the Barrens 22-23 and 25-25 overlap. By the time you finish Barrens 22-23 guide, (not including optional quests), you are 60% done with the Barrens 25-25 guide (in which several quests listed will be grey at that point).