This is only my assumptions.
It is safe to assume that these content are not for new players or those who are struggling early game. Even the normal mode of Doom tower, I have doubts that early game players can finish it. Probably only around stages 1 - 50 is doable for early game players.
I really don't like the crafting of new sets. I hope they just allow us to craft existing sets. New sets it means (some) of our old sets will be obsolete. Or make sets that will give new effects not a better version of old sets.
With the addition of Forging items. We should have additional artifact storage. I don't think it will happen anytime soon.