There's also that great moment when Max is confronting herself where she accuses herself of using the power just to get people to like herwhich isn't entirely true but is absolutely a valid deep subconscious fear of Max's. I know I used time travel to make friends with Daniel and Victoria and Alyssa and Taylor. And while some of that involved comforting them and genuinely wanting them to feel better, there's something insincere about the fact that Max can do that with anybody thanks to her power. Max opting not to use her power is her realizing that the relationships that matter will grow and survive without super powers.
That's a good point. Initially it seems Max really does have trouble making friends without the help of her power (though you could argue that's because everyone's an asshole), but by the end she's grown such that we can easily believe she'll be much more confident going forward.
EDIT:
Unlike the tagged game -- I don't think that the logic, fallout, and legitimacy of the timelines is at the core of the games story and themes. I don't think it's at all necessary to think about the time travel in LiS, it's more a tool for the the delivery of the coming-of-age story -- where as the tagged game makes this one of the core tenants of its story, it very much want's you to think about the outcome and repercussions.
Yeah, I definitely agree with that. But it does kind of tie in with what Chloe says, that no matter what happens, their experiences were real. You can take that figuratively, and in the sense that Max will always remember them, but there's also a literal sense to it in that that timeline will continue whether Max chooses to stay or not. But yes, that's definitely not the main focus like it is in the other game.