To me, feels like more pressing issue would be to increase the ease of tagging, grouping, filtering, ranking, etc. Specifically, if you see existing coverage of a topic, it’s easy enough to revive it if you’re aware of how HN handles duplicate detection, but there’s no way to enforce users having to vote on comments with fresh eyes, hide comments that don’t have significant new sub-comments, discover significant new sub-comments, etc. Not to mention need for comment notifications and user responsiveness indicators. (Insert yet feature to support various user sub-use cases.)
All and all, reliving prior content and/or having a complex multifunctional interface would take away from the centrality and freshness of the home page experience.
I have wondered if dang would be open to allowing community to contribute to various approved feature additions; for example, better search, night mode, duplicate detection, etc.