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wnoise comments on What I've learned from Less Wrong - Less Wrong
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I don't see why the Copenhagenite can't make the exact same objection here. Perhaps it would be clearer if you gave an example of how one would perform the time reversal of a measurement? If I have a z spin up electron, and I put it through a Stern-Gerlach device and find it is now a x spin up electron, how do I go back to a z spin up electron?
As stated you can't. In the MWI picture, you are split into two one who has measured it x+, the other x-. Both must send it back to have it recohere, and they must at the same time erase their measurement of which way it went -- really anything that distinguishes those two branches. They can record the fact that they did measure it, as this is the same in the two branches.
A person obviously can't just "forget", and will at best leak information into the environment, encoded as correlations in the noise of heat. A (reversible) computer, on the other hand, works quite well for doing this.