It is all relative. You think the previous tower had better rewards? You know that you can farm 2 full O2 items in 3-4 days right? Getting 1 gaia stone takes 1 month. I don't see how the rewards are worse now.
Either way I think the challenge is the main reason for a feature, I don't really care about more equipment. What are you going to do with more equipment if there is nothing to use it against?
Really, are we playing the same game? Who has reached the point of just having so much excess gear that they are like, shit I wish they would put more toons in this game so I can use this stockpile of shit I have accumulated. As far as the O2 items, yeah maybe in sweeping la-la land. 80 fragments with a rate of maybe 3 /10 sweeps. How many diamonds do you burn crafting an O2 item in 3-4 days. Transforming Mask = O2, 80 Staff of Illumination, 80 Primordial Stone, 80 Etheral Cloak so dont give me that shit that an item can be crafted in 3-4 days. Maybe if you are blowing a shit load of gems.