I can't speak for curun1r, but the requirement for a whole OS is pretty restricting, especially when you already have a whole environment with configuration man

I can't speak for curun1r, but the requirement for a whole OS is pretty restricting, especially when you already have a whole environment with configuration management etc. based on another OS in which you invested a lot of time. From personal experience (granted this is from the early days of CoreOS), CoreOS is only really viable if you are going for a hardcorde "dockerize everything" approach, which has too much unpolished points as of now. As of now I'd rather use a rigid base (whatever OS, chef, mesos, marathon) with the more fluid parts (services inside docker, pachyderm, etc.) on top.