About security vulnerabilities on systemd:
https://www.scientificlinux.org/category/sl-errata/slsa-20162610-1/
https://www.phoronix.com/scan.php?page=news_item&px=Systemd-230-FBDEV-Woe

Beware of the combination with Wayland. Also systemd is not the only problem, Avahi has been a problem for a while.