It's not a false contradiction (dichotomy?). In general, non-standard modifications can break the default configuration, even in your hotplug example. If they can break the default configuration, I'm simply saying don't complain when they do.

The OP is running GNOME and complaining because he's not using systemd and it broke something (non-standard configuration) and because he can't understand the d-bus-controlled cgroups system (complicated system internals).