Just the other day someone posted the ImageNet 2012 thread (https://news.ycombinator.com/item?id=4611830), which was basically the threshold moment that kickstarted deep learning for computer vision. Commenters claimed it doesn't prove anything, it's sensational, it's just one challenge with a few teams, etc. Then there is the famous comment when Dropbox was created that it could be replaced by a few shell scripts and an ftp server.