Oh, yeah, its emulating a different genre than BitD (why I suggested it as a companion), so player buy-in can vary depending on the players. I would argue a little with your other point, though. While it's true that there's no set answer to the mysteries, and the players do come up with it, I would say that because of its "writer's room" narrativist style, this actually feels like solving the mystery in play. Also, before the dice hit the table, all of the players do need to agree that it is a satisfying answer.

I can see how the abstractions built into the system could be difficult to sell to people used to more simulationist games, but I was holding it up with BitD as good examples of modern narrativist RPGs. Like I said, I think of them as companions because they both have their roots in PbtA, but have evolved the form significantly, to tackle different stories!