“I would say that the concept of probability works fine in anthropic scenarios”—I agree that you can build a notion of probability on top of a viable anthropic decision theory. I guess I was making two points a) you often don’t need to b) there isn’t a unique notion of probability, but it depends on the payoffs (which disagrees with what you wrote, although the disagreement may be more definitional than substantive)
“As you have no way of affecting a universe that doesn’t contain you, or someone reasoning about what you would do, you might as well behave as if you aren’t in one”—anthropics isn’t just about existence/non-existence. Under some models there will be more agents experiencing your current situation.
“You might, or might not have an easier time effecting a world that contains multiple copies of you”—You probably can, but this is unrelated to anthropics
“I would say that the concept of probability works fine in anthropic scenarios”—I agree that you can build a notion of probability on top of a viable anthropic decision theory. I guess I was making two points a) you often don’t need to b) there isn’t a unique notion of probability, but it depends on the payoffs (which disagrees with what you wrote, although the disagreement may be more definitional than substantive)
“As you have no way of affecting a universe that doesn’t contain you, or someone reasoning about what you would do, you might as well behave as if you aren’t in one”—anthropics isn’t just about existence/non-existence. Under some models there will be more agents experiencing your current situation.
“You might, or might not have an easier time effecting a world that contains multiple copies of you”—You probably can, but this is unrelated to anthropics