H-J, Here's another thing (not sure if you are able to do something about it, though). There is a certain old thread which had 496 posts. A_is_A posted a new comment yesterday. So on my mobile device, I saw there was a new comment, but I had to scroll all the way down the 496 posts in order to see the new one. My thumb is still numb from that.... Isn't there a setting for the mobile site which automatically sends you to the page in the thread which contains the newest post?
Oh, I totally ignore or avoid many threads, but often I click on them just to rid my screen of the new-post notice. Now, I'm recalling that the forum sends me to the first new post in a particular thread rather than the actual final post.