Why is it frustrating? And if frustrated readers can't stand it because it frustrates them, why not ignore it then? Why reading it in the first place?
Because of the way the forum is structured. We cannot "ignore" threads. We click the tabs to catch up on the latest stuff. And bumped threads from years ago show up on the list as new unread threads. It interferes with the "flow"?
That's really all it is I think.
There is a LOT of content that flows through this site daily. Some folks have neither time nor patience to sift through it all. Again, there is a TON of new stuff on this site daily. It can be unwieldy.