I really do think the plot of this game is very interesting, and I had a good time dissecting it all, but I feel like having the infinite alternate universe plot device really trivializes the meaning behind your previous actions, and kinda dampers the whole setting of Columbia as well. It started with Booker and Elizabeth skipping through a few universes willy-nilly halfway through the game just to pick up some weapons, not really thinking about what it means to actually be in an alternate universe. I mean, did any of that shit really matter anyways? They could have entered a universe where the Vox were all killed, and at the end you just fight Comstock guys instead of Vox guys. As far as Booker and Elizabeth's actions go, where they were, when they were, and what they were doing didn't really matter until the siphon was destroyed. It was all seemingly orchestrated by random universe rifts that you enter and the Luteces.