I'm no expert, but I thought one of the big selling points of cgroups are that they form a hierarchy.
So systemd could just carve off it's own portion of the hierarchy, provide management of that via dbus, carrier pidgeon etc. [I.e., /sys/fs/cgroup/systemd/ which systemd already uses.]
And leave outside of that hierarchy alone for whatever other uses people want to put it too.
What functionality can systemd provide by taking over the entire hierarchy instead of just using it's own sub-hierarchy?
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