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Manfred comments on Stupid Questions Open Thread - Less Wrong Discussion
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The word "exist" doesn't do any useful work here. There are conceivable worlds that are different from this one, and whether they exist depends on the definition of "exist". But they're still relevant to an anthropic argument.
The habitability of the universe is not evidence of anything because the probability of observing a habitable universe is practically unity.
You're right that observing that we're in a habitable universe doesn't tell us anything. However, there are a lot more observations about the universe that we use in discussions about quantum mechanics. And some observations suit the idea that we're know what's going on better than others. "Know what's going on" here means that a theory that is sufficient to explain all of reality in our local neighborhood is also followed more globally.