It's mostly an artifact of our initial focus - a great integrated user experience - combined with the fact that Docker became incredibly successful, incredibly

It's mostly an artifact of our initial focus - a great integrated user experience - combined with the fact that Docker became incredibly successful, incredibly fast. Image management is combined with runtime since the very first version. Over time we've been shifting our focus to quality, modularity and security, but with the massive adoption everything is slower to design and implement. The community is also not unanimous on the topic, see for example https://groups.google.com/forum/m/#!topic/docker-dev/mzpAga_XZ-Y https://groups.google.com/forum/m/#!topic/docker-dev/mzpAga_...