You didn't get the point, I don't want to see last posts of a person, I want to start reading a topic from the last post unread by me forward!
See this print from another forum as example:
This topic has 951 pages but yesterday, when I last read it, it only had 950, but if I click on that "last post" icon I go to the last post unread by me and not the last post of the topic.
This way it's easier to track any reply made after my reading