Systemd takes over the entire boot process. The script /etc/init.d/boot is completely ignored, and 'startpar' is never called. The sysv initscripts including /etc/init.d/boot.* are handled natively by systemd.
Every service that installs a native systemd service file, completely disables that way the sysv init scrip when systemd is used. The newer versions of D-Bus and udev install these service files, and therefore the scripts in /etc/init.d/ and all the symlinks there are ignored for these services. Over time, most commons services will not longer use init scripts if systemd is used to bring up the system.