Details From Harry Potter and the Cursed Child That Make No Sense
Time Travel Reduces the Stakes
As soon as you show that the world can be irrevocably changed by time travel, the world you’re seeing starts to feel less and less like the real one. It becomes clearer and clearer that you can just go back and time and keep screwing with things until you get it right, which is precisely what they do.
As a result, the stakes of the story feel smaller. The mistakes that these characters make don’t ultimately have any real consequences. After the story ends, things are pretty much exactly where they were at the start. A lot happens, but nothing really changes.