I can totally understand the issues of unification there, and very much understand issues with poetterings perfectionist attitude to some issues. But do you know how much time I've spent on shitty, arcane, hand-crafted init-scripts?

Containers as a whole would be another great question there. I have a certain class of applications I wouldn't want to run without a container orchestration anymore after a certain scale. But on the other hand, I do have a bunch of systems I'd almost never want to run as containers for serious data.