My issue is less around changing the story, more around incompleteness.

They’re making the turnout of certain events hazy and mysterious to allow for multiple future turnouts, and let them keep merchandising certain characters. And, they’re letting the conclusion keep going for multiple games.

It’s more of a monetary strategy than a storytelling one. Notably, FFXIV sells each of its expansions, but each one has an ending that feels like a victory and a satisfying conclusion to a story even when it sets new things up.