Docker lets me focus on cool problems like "which commands can I use to free up space on this cloud-based container-running VM, given that there are 0 bytes free, and many tools will crash if they can't make a tempfile/dir?".
At least, that's been my experience when maintaining a mess of other people's Docker crap.
Maybe it will be some day, but these orchestration and deployment tools built on Docker have enormous hidden costs.
IME, Docker takes an enormous amount of focus away from the customer problem and moves it to the how to get this mess working problem.
Now may be the right time in a given business to make that shift in focus, but to claim that it will be "free" is just misleading (IME).