I think this is omitting a crucial aspect - even if there are repeat questions, they often have different answers in 2016 than they had 2009.
Sure, a question like "how can I get colored ls
output?" won't have a different answer for the next 50 years. But if you look at this answer about bluetooth connection of two computersthis answer about bluetooth connection of two computers I gave yesterday, it is evident that this answer is specific to a systemd distribution only. Any answer older than 2 years is simply not working anymore.
One problem I see is: Often, just a superficial boilerplate answer is posted. It might not even work anymore due to changes in the underlying system. I hope that we can weed out the answers which have outlived their usefulness. This is the reason why it is not a problem for me when the same questions get asked repeatedly. One solution could be distribution-specific chapters, but these tend to grow over years when new knowledge is added, and they are rare.