One thing that nags me testing Nostr out is I can never be sure if I'm seeing all the replies to an interesting post. I've setup a few clients, each with different (but pretty standard) relay setups, some overlapping and some not, and I've been using them to examine popular posts. Each client often presents a separate story of the life of a given post, some replies are here but not there, some are there but not here, some are missing certain types of replies (like quote replies), some aren't, like numbers can jump around a lot, and so on. I also realise there is filtering at the client level too, keeping out replies from new users and such, and that further complicates things. I hear this outbox implementation is slowly being adopted, but I don't think that really solves the problem to anywhere near the degree I would hope, as there are just too many variables at play. Maybe the idea is to just accept that—i.e when it comes to strangers' replies on strangers' posts you'll never really know how much of what you're seeing represents the totality of the story of the post?