This is a great idea. But I find that the churn rate for HN is quite high in comparison to reddit, and I need to check HN quite a few times a day to not miss in

This is a great idea. But I find that the churn rate for HN is quite high in comparison to reddit, and I need to check HN quite a few times a day to not miss interesting stuff. Also, though this case is probably rare given the shared interests of HN and subreddits, it's still possible that you could miss out on something that you would have potentially found interesting, but the majority did not.