I imagine Eliezer is being deliberately imprecise, in accordance with a quote I very much like: "Never speak more clearly than you think." [The internet seems to attribute this to one Jeremy Bernstein]
If you believe MWI there are many different worlds that all objectively exist. Does this mean morality is futile, since no matter what we choose, there's a world where we chose the opposite? Probably not: the different worlds seem to have different different "degrees of existence" in that we are more likely to find ourselves in some than in others. I'm not clear how this can be, but the fact that probability works suggests it pretty strongly. So we can still act morally by trying to maximize the "degree of existence" of good worlds.
This suggests that the idea of a "degree of existence" might not be completely incoherent.
I suppose you can just attribute it to imprecision, but "I am not particularly certain ...how much they exist" implies that he's talking about a subset of mathematically possible universes that do objectively exist, but yet exist less than other worlds. What you're talking about, conversely, seems to be that we should create as many good worlds as possible, stretched in order to cover Eliezer's terminology. Existence is binary, even though there are more of some things that exist than there are of other things. Using "amount of existence&quo...
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