Time travel is a much more useful and powerful ability. Basically like a real life "save/load" feature like in a video game. Plus you can obtain immortality.
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Good plan
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Yes but the burden is also much, much worse, the potential consequences could be devastating.
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That's not really proven just a possibility, it's equally possible that the differences you make where already made by you which led down the timeline you already knew changing nothing.
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[spoiler]this man has a point[/spoiler]