After completing the 4th difficulty (72% Att/Def in Industrial Age), I have a few comments on changes I like and those I would like to see tweaked.
1. First and foremost, having a 50/50 chance of getting the Fountain of Youth as the final prize seems okay. Having that same 50/50 chance of getting a Store Building is a slap across the face. My reward for destroying my army or breaking my bank of goods is getting an item that allows me to take a building out of my city. Am I supposed to be happy that I was rewarded an item that's use decreases the value of my city? Sure, Store Building is useful maybe once every few months of playing, but having it as a final reward is just insulting.
Alternative: Big Diamonds, Multiple Premiums, Huge Medal Pack, 50 FP, SoK, etc. Completely the 4th difficulty is quite the undertaking for the vast majority of players. I will probably delete my store building because it taunts me and clogs up my inventory.
2. Motivation Kits are worthless to anyone with a decent-sized guild and friends after a certain point. Especially after Colonial Age. These have no value whatsoever to a significant amount of people playing the game.
Alternative: One-up or Reno Kits, maybe small medals or small FP. Anything but Store building or typical decorations. Anything.
3. The new 2x2 decorations are actually useful! For the first time since my first couple weeks, there are decorations that might actually be worth putting into my city! Their happiness output is finally significant.
4. Reduce Medal cost when negotiating on 4th difficulty. I think the medal costs are a bit too high and could use a reduction.
5. Increase the size of goods packages in 4th difficulty. Negotiating will wipe out your inventory. After spending 50-100 goods on an encounter, receiving 35 back is supposed to be a reward?
6. Rewards following the completion of each difficulty. I would like to see a little reward bundle following the completion of difficulties, especially the 4th. Maybe a small amount of medals, some goods. The 4th difficulty should have a higher scaled bundle to go along with the final encounter reward. After all, it is extremely costly and many have either destroyed their army or their economy to complete it. Can I trade in my Store Building to get back the hundreds of goods I spent? I will throw in the Motivation Kits to sweeten the deal.
7. Limited Customization. This would take a lot of discussion, but it would be really cool if we were able to individually customize the rewards toward our preferences. I would love to be able to rid myself of all Store Buildings, and Motivation Kits, or reduce their odds at least in favor of something useful over .01% of the time. Perhaps this could be built into the Tavern with small increases and decreases in percentages for each reward.
8. I enjoy the FP, diamonds, and medal rewards for the most part. As mentioned earlier, medal rewards can be negated, however, because of their high cost in negotiations.
9. Get rid of the crappy decorations from ToR relics. I don't have use for a single one of them. A polished cultural building is so much more efficient, making 99% of decorations only useful for completing quests. They can be cool looking, but they have little real value.
I think that sums up most of my critiques. Overall, I think the update to GEX is headed in a great direction. I think there are a couple adjustments that can be made that would greatly improve satisfaction among the vast majority of players. As of now, I don't think the rewards are quite good enough to encourage players to consistently absorb the high costs of the 4th difficulty. I realize it is meant to be difficult to complete (and it is), but the costs as of now are too high. I look forward to seeing how this develops.