Very small QOL, but it all adds up - As a user, I wouldn’t really care how much time a person spent on the forums, what I’d really care about is knowing when was the user last seen (online), so I can tell whenever my reply to that user would be seen quickly.
Regarding the post count - I feel like it conveys more information than the “Read” statistic, it’s useful to see if the person is just a lurker or also an active participant on the forums.