yeah, per 'site' moderation has still a massive influence over this. /r/askhistorian is very strict about answers, anything that deviates from sourced and on topic will be removed. You can read anything there and have clear concise deep answers even years after.
this is something I liked a lot about reddit, there's no micromanagement, it's very organic and free. I'm not always for senseless freedom but in this case I found it to yield interesting things.