I do think HN is one of the better moderation systems since this is one of the saner places on the internet and you can still configure things so you can at least see all the content, though you can't interact with it all. I would just prefer it if I was in charge of saving myself from bad opinions or whatever motivates people to down vote posts into oblivion.
I like it when it's about flagged posts. I have the option enabled to show these posts and I would vouch if there's something worthy in it. So spam and other BS is "removed" but I still can take a look at it and see it for myself.
Overall, I think HN is one of the best moderated online places.
- user A says vaguely racist thing
- user B calls person out for racist thing
- user A cannot downvote a reply, so they flag it instead - making it disappear
So both can silence someone, but in one case many people need to disagree with someone and in the other you just need one person (or one person with an alt account if you want to go and revert a "vouch"). So if anything flagging is more prone to abuse than downvoting. I try to read greytext comments when I can and vouch whenever it looks unjust (and do something similar for downvoted posts) but from the looks of things not many people do.
edit: might as well include my example - https://news.ycombinator.com/item?id=33164001
So I'd understand if I was downvoted and called out for my confrontational response to racism. Because at that point I'd reply that actually treating this kind of casual xenophobic comment as unserious and mocking the person is the most effective counter to this kind of behavious. Getting bogged down in debating the merits or worth of any individual person or where they might "belong" is exactly what this kind of person wants to do.
The good thing about HN is that the moderators are reachable and they do respond intelligently. Unlike AI moderation, you can send an e-mail about it and dang will respond to you and explain why something happen and you can discuss it.
I had my account restricted multiple times and restored once we got on the same page(I don't agree with everything but once I see their point, I can work with it). I had wrongfully flagged comments unflagged by sending them an e-mail too.
It's not perfect but it's pretty good and miles ahead than anything else online.