Yes, I agree. I have found it invaluable too.The way the search works, brings up not just the topic you asked for but all the threads that contain the words you used. It brings up some unlikely topics and some that are more interesting than the one you may have been looking for.
I would liken the experience to placing old newspapers down, to protect the floor, when you are going to decorate or make a mess.
On the floor you see all these fascinating stories, that you paid little heed to when first reading but which now compel you to sit on the floor and read them thoroughly. In my case it is probably an avoidance tactic?
All you have to do to bring these threads up (if you think there is mileage in them, there is not a current thread on the subject and they are not too long), is add your thoughts and it will appear in the current threads. They do seem to leave quickly once there though, even when new contributions are made there (or is that my imagination)? So a new thread with a reference or a link to the older one, maybe the better option. If you can't do a link, just asked and some kind soul will help.