> Because it's a nice way to apply configuration changes made to
> /etc/sysctl.conf without restarting the whole server?

Systemctl doesn't offer hot reload unless the 
controlled daemon offers the capability in 
the first place. The only thing systemd does 
is hits the controlling process on the head 
with a known conf-reload signal or (gasp) a 
DBus control statement. Both of these can 
be done just as well with an rc script, and
without restarting the service.

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