it was an illusion in the first game anyway, the vast majority of your choices didn't matter, in fact only your final choice (to undo it all or not) matters. If you save Chloe, the town is destroyed and everyone dies anyway so none of your choices matter. If you go back and let her die as she was supposed to, time from that point is rewritten completely so none of your choices matter. The only part of that that really bothered me was that (arguably) the most powerful moment of the game, Kate's suicide, is meaningless at the end of the game. If you let Chloe live then Kate either died jumping from the roof if you failed to save her, or died with the town even if you did save her. If you let Chloe die then Kate lives, whether she jumped from the roof or not. It made the impact of that part of the game feel suddenly really hollow for me. Or maybe that's the message - that your choices don't matter and you can't really change anything in the end... As it is strongly implied that saving Chloe means that the whole world is eventually screwed.