If Job's approach would have 'won' most times according to his own utility function (given a random cancer, by selecting non-invasive approaches over surgery) then he could be more rational than appears in this particular Everett branch.
I think this is why. Speak of what was reasonable for either him or a perfect inference machine to have expected given the information he had, but not of parallel universes with alternate histories.
I see ... in all nearby Everett branches he would have the same kind of cancer, but make different decisions. Further out, the cancers would only be subtly different from each other. Further out still, he might not have cancer at all, rather than different kinds of cancer.
Yes, it would have been much more accurate to speak of a perfect inference machine with the same information; only then could I integrate over all the possible cancers he 'might have had' as I intended. Thanks.
From Quora: