I personally like these changes. I literally just logged back onto the boards today, but I've already seen positive changes. For instance: this post. In order to make any sort of point about the post itself, we (the board-ers, or what-have-you) are now forced to: 1) click on the post 2) ?read? the post 3) post a comment in reply.
Those comments can then be properly voted on, showing public opinion without cluttering the space too much, but forcing some minimal level of engagement. I think it's a brilliant way to approach the issue. Maybe not perfect. But an excellent step in the evolution of social media.
As to the matter of navigability: maybe that's an appropriate critique. I'd love to see how that pans out. (I've not scanned through enough posts yet to form a concrete position on whether or not the change improves, degrades, or otherwise impacts my personal navigation through board posts.)