You and me against the end of reality ... we might need some help!
Prince Renethal
For the 20%, the 5% are here spending long hours testing and figuring out how things work and writing up guides. For the 80%, this expansion may be a joyous one of sublime discovery, or may be a frustrating experience while they figure out what they can in game. Sadly for them, some of the systems that have no catch up mechanisms, like Soul Ash as mentioned by cee2027, will set them forever behind their 20% fellows unless Blizzard implements a change.