Because of real-timeness (you don't need to refresh a webpage, you can see if someone is typing). I am not aware of a forum software that have this feature (I d

Because of real-timeness (you don't need to refresh a webpage, you can see if someone is typing). I am not aware of a forum software that have this feature (I don't know them well, so I can be mistaken). But most of the time you don't need it.