I really like the idea that the players are part of constructing the phenomenon. It takes a lot of work off of my plate as a GM, and it gives me the freedom to give the players a bit of what they're looking for. I hope that if I run this again, I get a chance to use the NPC's to greater effect.
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So glad you had a fun time! The collaboration around the "canon" of the phenomenon is one of my favorite parts as well. And I feel like NPCs are a part of ttrpgs that always benefit from more time at the table. It takes a few sessions to get to know them but when you do? The payoff can be wonderful.
Happy gaming!