I agree. Once you've read a post, it shouldn't show up on latest posts. It didn't on the old board.
On the old board, if you had opened a thread and not read all the posts, any post that was there at the time lost its "new" marker the next time you came back. Now they never do. All the "n/t" posts that aren't opened make it look like someone has added something new.
Finally, I still want my thread hanger lines back. Even if I scroll up with the mouse, it's annoying not to see at a glance with the medium length threads who is talking to whom.