User blog comment:DaNASCAT/Introducing Service-Oriented Architecture, A New Approach to Software Development/@comment-26402117-20160830201117/@comment--20160831161905

We have done a number of backports, our experiment with Lua being the most notable. Backporting is a good way to quickly implement well-done software that we simply didn't have easily on our product development roadmap. But it's not super common for two reasons: 1) The scale of what we would be backporting is small and thus may not justify the engineering time AND 2) If something is important enough for us to want NOW on our site, chances are it's already been developed or in the process of being developed.