> But up until that point it would be good form to just have systemd default to a bog standard portable init wherever its highly specialised features are not available so hackers everywhere can at least attempt to bring such glory to their system and meantime be able to boot.
Why is this so hard to understand? systemd fundamentally depends on concepts like cgroups, they are not just an afterthought. Just have a look at the code.
Or, as an analogy: a team of engineers are building a maglev train. You are telling them to add wheels and a diesel engine, so it can also run on conventional tracks. Sure, it might be possible to add this stuff: by increasing costs per unit, ruining the design and reducing the maximum speed the train is able to travel because of the weight of the diesel engine.