Note that the argument whether MWI changes anything is very different from the argument about what matters and why. I think it doesn’t change anything, independently of how much what things in-universe matter.
Separately, I tend to think “mattering is local”. I don’t argue as strongly for this, because it’s (recursively) a more personal intuition, less supported by type-2 thinking.
OK but your original comment reads like you’re offering things not mattering cosmically as a reason for thinking MWI doesn’t change anything (if that’s not a reason, then you haven’t given any reason, you’ve just stated your view). And I think that’s a good argument—if you have general reasons that are independent of specific physics to think nothing matters (cosmically), then it will follow that nothing matters in MWI as well. I was responding to that argument.
Note that the argument whether MWI changes anything is very different from the argument about what matters and why. I think it doesn’t change anything, independently of how much what things in-universe matter.
Separately, I tend to think “mattering is local”. I don’t argue as strongly for this, because it’s (recursively) a more personal intuition, less supported by type-2 thinking.
OK but your original comment reads like you’re offering things not mattering cosmically as a reason for thinking MWI doesn’t change anything (if that’s not a reason, then you haven’t given any reason, you’ve just stated your view). And I think that’s a good argument—if you have general reasons that are independent of specific physics to think nothing matters (cosmically), then it will follow that nothing matters in MWI as well. I was responding to that argument.