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systemd "fully supports" sysvinit scripts in that it will use them if it must, but it is still the goal of the systemd authors to eradicate such scripts from the boot process.
Support may remain in a technical sense from now until the sun explodes but it will be useless if it is not use d (read: not tested) and not in use (read: I can no longer audit and edit my boot process).
Fact: one goal of systemd is to boot the system without executing shell scripts.
Fact: it is a goal of systemd to eventually get all daemons to stop using init scripts when running on a system using systemd.
I am not okay with either of these things.