For example: there's 2 or 3 threads about the same topic, and all you see is comments saying "this had been done to death" or "any need for another thread"
So what? Maybe the OP missed the previous threads, or had only just heard about the topic and didn't realise someone else had brought it up. Why is there any need to comment saying there's no need for multiple threads?
I can understand that people don't want to see the same thread over and over again, so why not just hide the thread? Or just don't click on it!