There is no point in having every single challenge mode encounter drop a 320 artifact. What I'm proposing will keep 320 artifacts in the rotation, but replace some of the redundant drops with actual usable loot like marks/cloaks/bonds that will actually allow us to change our appearance. If you missed the challenge 3 weeks in a row, you could easily wait another 3 weeks for the artifact drop to return. How could you be against this. If you don't already have a 320 artifact you really haven't tried to get one. This is the fourth week - that's 12 chances.