Au contraire, I'd argue HN is a very diverse site but it's the moderation by both users and moderators that makes it seem orderly and uniform. There are many stories that get flagged a-la blogspam, low quality, clickbait etc, and same with comments. Those that don't have merit by the community don't reach the wider audience. I think the conception that HN is uniform is a somewhat common misunderstanding, as evidenced by discussions on supposedly-trolls and the like: it isn't usually the case that someone is shilling or trolling, more often than not it's just someone with a different world view.