Great! I do see legitimate [dead] comments occasionally.
How will this affect shadowbanned users, though? Can a shadowbanned user's comment ever be vouched from the grave?
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I should add that moderators are still going to intervene sometimes—just hopefully not very often. For one thing, some decisions only we have the data to make. For another, some decisions are based on the values of the site and those are not open to change. But the long-term vision for HN is to make it as self-regulating as possible, and it's been obvious for a long time that the bulk of HN moderation should be done by the community. The only question is what the right mechanisms are to get us there, and vouching is a big experiment in that.