#42 - April 3, 2017, 12:06 p.m.
I get that these appearances are the new hotness and everyone is after them, which causes frustration. However, it's worth noting that the solo challenges to unlock the new appearances are intended to be just that; a challenge. We don't expect the majority of players to obtain them within the first cycle of the Mage Tower being constructed.
Our aim for these challenges is for them to be comparable to that of the green fire questline for Warlocks in Mists of Pandaria. In that case, only a few Warlocks were able to defeat Kanrethad immediately, but more and more were able to overcome the challenge as the expansion progressed.
As we progress through the course of Legion, your character will become stronger (through Artifact progression, gear upgrades, etc), which will naturally ease the difficulty of these challenges. Likewise, as more and more players complete these challenges, more community generated content will appear giving advice for those who are struggling.
Ultimately, each artifact appearance has a different source. Some reflect dedication to a particularly gameplay style, such as raiding or PvP, others for reaching milestones like completing the 7.0 Order Hall line. In the case of these challenge appearances, they are meant to show that you've truly mastered the nuances of your spec.