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I don’t mind time travel within certain boundaries. These cases are okay.

A: It doesn’t mess with the timeline, the time travel always had happened, and you can’t change a thing.

B: It creates alternate timelines so you can’t get back to where you were.

This means not travelling into the future and coming back from it. Because travelling back in time erases that future, making it meaningless.

There was a time travel story I quite enjoyed, that involved the MC being pulled into the future to save everyone from his childhood acquaintance who had taken over the world. It all went quite well, until he went back to his own time, and made a choice that complete erased the story making it pointless.