They are not mutually exclusive. An ideal system would honor the Dockerfile when it is present, and attempt to auto-detect the build method when it is not. Buil

They are not mutually exclusive. An ideal system would honor the Dockerfile when it is present, and attempt to auto-detect the build method when it is not. Buildpacks are great defaults when auto-detecting. That way, you get a nice out-of-box experience (push your code, something magic happens), and when you need more control over your build and dependencies, you can add a Dockerfile. I'm hoping this is what Flynn will do :)