Hmm, the paper doesn't seem to address the question I described in Is the potential astronomical waste in our universe too small to care about? To me, this seems to be a central open problem in the moral parliament model, as well as in moral uncertainty in general (see this version of it which applies to MEC), and has strong practical implications, so it's strange to see very little work from philosophers on it. It doesn't seem to be addressed in Andrew Sepielli’s PhD thesis or Will MacAskill's DPhil thesis, and Toby Ord told me there's not "anything particularly relevant to that question" in his and Will's upcoming book about moral uncertainty (although that's because "the book doesn’t really include any post-2014 thinking at all").

Nice! Seems like a cool paper. One thing that confuses me, though, is why the authors think that their theory's "moral risk aversion with respect to empirically expected utility" is undesirable. People just have weird intuitions about expected utility all the time, and don't reason about it well in general. See, for instance, how people prefer (even when moral uncertainty isn't involved) to donate to many charities rather than donating only to the one highest expected utility charity. It seems reasonable to call that preference misguided, so why can't we just call the intuitive objection to "moral risk aversion with respect to empirically expected utility" misguided?