Oh i wouldnt say its worse at all. I prefer nested replies all the way. Regardless, i still wouldnt say lemmy fits the forum format, again due to the way you access the most recent replies.

In a forum thread, you go to the last page and youve found the latest comment. In a Lemmy post, even if the nested comments arent hidden, its not obvious at first glance which one is the latest comment.

Also, if you "bookmark" a forum thread, youll get notified of any new replies in said thread. On Lemmy, you can check the latest comments from an entire instance or community. But not for a specific post.

Again, id never phrase lemmys format as worse, for i greatly prefer it. But i wouldnt consider it a forum. It simply displays the information diferently