I still have the same rovers from 4 years ago. It is nice to have a thread available with info that can be helpful from past experiences in one spot. I've been on other forums when folks just repeat the same threads over and over again every few months asking the same questions. The main differences between knowledge and wisdom is time, experience, and application of that past knowledge in new/different ways. New threads are knowledge, old threads with new information and experiences are wisdom.
Case by case depending on the thread like when the original topic is no longer being discussed towards the end.