Slider comments on Your transhuman copy is of questionable value to your meat self. - Less Wrong Discussion
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Intuitively, merging is more difficult than forking when you're talking about something with a state as intricate as a brain's. If we do see a world with mind uploading, forking would essentially be an automatic feature (we already know how to copy data) while merging memories would require extremely detailed neurological understanding of memory storage and retrieval.
Forking would mean thinning of resources and a lot of unneccesary repetition. You could also calculate the common part only once and only divergent parts once per instance with fusing. Early technologies are probably going to be very resource intensive so its not like there is abundance to use it even if it would be straigth forward to do.
I guess this all depends on what kind of magical assumptions we're making about the tech that would permit this.