The universe you dislike is in the same state as the one you like, there's just more of it.
I think you're talking past each other. Rowan is assuming the amount of happiness and suffering to be distributed across several people, where adding another person with the same suffering/pleasure ratio shouldn't change anything, and dunno is, I believe, talking about a single person's perspective where, once you've reached a certain amount of suffering, it might be impossible to outweigh it.
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