I believe that comments at deeper levels (more than 5-6 levels) have the reply link not show up for a certain amount of time, which is a relatively recent chang

I believe that comments at deeper levels (more than 5-6 levels) have the reply link not show up for a certain amount of time, which is a relatively recent change. Even for those, I've found that if you click on the "link" link for that comment, you can usually find the reply link on the resulting page, if that makes sense.