What does Stack Overflow want to be when it grows up?
One challenge not discussed here is when an accepted and highly voted answer _used_ to be a good answer, but no longer is in later versions of whatever software/platform/library is discussed. This is also something that gets worse over time, like the uniqueness problem.I think it's worse than the uniqueness problem, multiple duplicate _good_ questions/answers don't actually harm, misguide, or delay anyone looking for an answer; one _wrong_ one does.And of course, if you try to ask a question again because you think the old one might be outdated (if you were _sure_, you wouldn't have to ask probably), it'll likely get closed as a duplicate. :)