Seeing a Code as Craft talk at Etsy 10 years ago, or however long ago it was, changed how I develop web services completely. It was truly a revelation. Continuous deployment is fairly common now, but back then it was still radical enough that I thought "this can never work!" I never went all the way to feature flags instead of branches, but maybe I should give that a shot too.
The name of the post (The Push Train) made me think it's about some strange train set up where the locomotive is at the end, rather than start, of the train. It made me wonder what could be the possible advantages.