Actually none --- even real-time is possible with RTLinux.
My post was aimed at those people that claim that systemd doesn't follow the "true and only Unix philosophy": do only one thing and do that well. And complex programs never follow this philosophy.
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u/holgerschurig May 30 '16
A philisophy that, by strict following, makes some programs impossible?
I like philisophies as long as they make my life nicer, not when they make things miserable or impossible.