CGroups manager API

I think thats a good summary, the question is whether there is value in systemd also offering the low level interface like cgroupsmanager intends, in addition to the high level interface, or would that break systemd service management if it exposed all the low level details? What kind of clients are expected to be using either of these interfaces, is this for virtualization management agents to setup containers across a shared cluster for customer jobs? Can this use case be accomplished with the kind of interface that systemd is planning to export or does it require the more low level interface that cgroupsmanager intends to export, or can the intended use cases for the dbus interface be accomplished with either system?

It would probably be suboptimal if an application need would create hard dependancies up the stack all the way to the init system such that certain workloads fundamentally can't be run on systems with incompatible init systems. I would prefer to pick the best init system (which I think is systemd) and not lose the ability to run whatever services I want.