I got the idea of really getting back to basics, and leveling a toon with no heirlooms in solo PvE. Not necessarily doing all the quests, since randomly killing mobs is faster, but definitely on a class that is not that self-sufficient. Leveling a Druid or a Paladin is easy because you have so many effective self-healing and defensive tools, but leveling as a Rogue, a Mage, or a Warrior is not so straightforward.
I just felt like this whole drive to kit everyone with heirlooms, and blow through all this content like it's nothing to have 11 character slots all doing garrison duty, is trivializing a great, deep and polished game with more content than perhaps any other in history. And so much of it is still there for me to re-experience, occasional hard knocks and all.