SPOILERS!
My players asked for a shorter campaign. If we go another 10 years, my oldest player will be in his 70s by the time we finish. I have some ideas I want to try out: I would like to find something prewritten, because it does save me some work. We had done a Pathfinder path before this, but we wanted something more investigative and Zeitgeist really fit the bill. I am considering Burning Sky, but I also would like to try something Asian-themed like Legend of the Five Rings. It can't be too rules heavy, because after 10 years my wife still doesn't know what dice to roll in Pathfinder. I also thought about doing something like a cross between Mobile Suit Gundam and The Expanse, but I don't think my players will go for it. Other ideas include Hillfolk, Fate, Titan's Grave or even Azurium.
As far as the planar alignment goes, the player I nominated as Asst. Chief Inspector for the team drove returning the world to what it was. The chaotic player in the group kept pushing for something more interesting, but the other three followed their nominal leader.
One criticism, I never explicitly understood what the Prestige was for until the final battle. It would have been useful to have it explained to the GM upfront that the Prestige gathered over the adventure is also used to determine how much support is there for the players in the final conflict. It seems to me that it was used early on, but somewhere in the middle it wasn't mentioned anymore. I mean, when they rescued Alais Primos from the dragon or when one of the party became a member of the Unseen Court, I would think that should have raised the relevant Prestige. But there was no mention of Prestige that I remember. In the end, since my players succeeded at just about everything they did, I just handwaved and assumed they maxed out their Prestige for all the parties.
As GM I had a more in-depth view of the themes: nature vs industry, free will, forgiveness, justice. I am sure I can think of others.