But if they both use microdooms, they can compare things 1:1 in terms of their effect on the future, without having to flesh out all of the post-agi cruxes.
I don’t think this is the case for all key disagreements, because people can disagree a lot about the duration of the period of heightened existential risk, whereas microdooms are defined as a reduction in total existential risk rather than in terms of per-period risk reduction. So two people can agree that AI safety work aimed at reducing existential risk will decrease risk by a certain amount over a given period, but one may believe such work averts 100x as many microdooms as the other because they believe the period of heightened risk is 100x shorter.
I don’t think this is the case for all key disagreements, because people can disagree a lot about the duration of the period of heightened existential risk, whereas microdooms are defined as a reduction in total existential risk rather than in terms of per-period risk reduction. So two people can agree that AI safety work aimed at reducing existential risk will decrease risk by a certain amount over a given period, but one may believe such work averts 100x as many microdooms as the other because they believe the period of heightened risk is 100x shorter.