My answer to most of this is that you want to limit how much feature flags actually cover. My ideal : feature flags cove just the very last mile of a feature. S

My answer to most of this is that you want to limit how much feature flags actually cover. My ideal : feature flags cove just the very last mile of a feature. So it would just cover displaying a feature to people, for example. The "testing gap" being limited to visibility helps a lot. Of course in the original article there's not much to be said, and I would have probably shipped the "handle the new header" functionality on the server as-is. Feature flags wouldn't really help! But there are so many things where feature flags have been helpful. The main point is that you want feature flags to help control usage, but really new features that would use them should do their best to not look at the flag inside of the business logic, because that's the stuff that's brittle.