Sadly, you are all missing the point. Too much philosophy and no analysis. Which is surprising to find on these websites.

This is what I recommend: web.archive.org

I think that you are all far more knowledgeable than I ever hope to be, but you are missing the point. Nothing needs to be manually tagged. Webpage creation date and the number of hits over the years are excellent indicators. There is analytical data galore since day two of the interweb, oops, I meant "internet". These will not be deleted, but archived and as accessible as they are now but not showing up for solutions of the recent years. .