Internet Kraken said:
Because there is no reason not to. The thread you are trying to make already exists, so instead of making the same thread twice just use the old one. You wouldn't be complaining if the thread was only 2 days old. The fact that it is from December is irrelevant as that has no effect on the actual discussion.
Of course the time in which it was posted is relevant! Nobody wants to have the same discussion they had two days ago, but nobody is going to get made if we have the same one that was had more than half a year ago.
I don't think you get the fact that this site has no problem with repeat threads, it only has problems with repeat threads that have been done recently. If we were to go by your logic, we would have no new threads, since approxamately 90% of every thread on this site has been done at least once before.
The only way your method could be understandable is if in the last couple of days we had been swarmed with loads upon loads of "What's your obsession" threads. Which upon close inspection, we haven't.
Oh, and stop it with the unnecessary use of the "use the search bar" thing, it's just annoying.