I got a downvote recently on my answer to this question which was asked in 2011. I replied in late 2015 and someone edited the question down to one line a couple weeks later. What's up with that? If the question was there for 4 years and got lots of Answers, how can you just sweep in and "improve" it much later? A lot of the context for the many, many answers (and comments) was completely lost! Whose idea was that???
I have to protest that you should not try to make the past better by pulling the rug out from under everyone who contributed. I don't care about the downvote, but it alerted me to this situation. I have seen this happen on other sites (like Christianity): questions that were Open and had some good responses for years were recently closed as being "Too Broad", "Off Topic" etc. Why the sudden change of heart? Was the past really so bad that you have to redact most of it?