Which is a good reason to add a reply-notification system, not a good reason to block replies
If they wanted a notification system I'm sure they could have implemented it.
On the other hand, it can be hard to discover replies, and certainly new/interesting comments in large threads, when you want them. I'm currently working on a new-comment-highlighter (draws a colored bar to the left of comments since you last viewed the page) as one step toward helping with this. If anyone wants to help test this, email hn@ycombinator.com and I'll switch it on for you.