We are interested in integrating DatoCMS with Optimizely. The use case is that content authors want to test their copy for the one most likely to increase conversions. This would necessitate duplicates of individual fields or possibly entire pages / posts to facilitate different user flows.
This kind of integration would also facilitate feature releases. For example, a new product is scheduled for launch, with an unknown date or time. We could create the content ready, then use a feature flag to make it available to the static site when it is due to go live.