[CentOS] systemd missing something?

"Note that traditional init scripts continue to function on a systemd
system. An init script /etc/rc.d/init.d/foobar is implicitly mapped
into a service unit foobar.service during system initialization."

That's what it says in /etc/init.d/README.

However, what it implies doesn't seem to work out.

In the same directory as that README is a file called "network" which is 
symlinked into the various /etc/rc.d/rc?.d/ directories, i.e.:

# ls -l $(find /etc/rc.d/ -name S*network)
lrwxrwxrwx. 1 root root 17 Jan 26 15:23 /etc/rc.d/rc2.d/S56network -> 
../init.d/network
lrwxrwxrwx. 1 root root 17 Jan 26 15:23 /etc/rc.d/rc3.d/S56network -> 
../init.d/network
lrwxrwxrwx. 1 root root 17 Jan 26 15:23 /etc/rc.d/rc4.d/S56network -> 
../init.d/network
lrwxrwxrwx. 1 root root 17 Jan 26 15:22 /etc/rc.d/rc5.d/S56network -> 
../init.d/network

But "network" isn't executed on boot. However, it does work when I run this:

# /etc/init.d/network restart

So is this a bug, or is there something else that needs to be done?