Which shitty distro are you using? On RHEL, systemd sends messages to syslog by default. You have to go out of your way to stop it fro doing so. There are plenty of issues with systemd, but the troubles most of the rants criticising systemd are either imaginary issues or problems with shitty distros with stupid defaults. This makes it easy for them to say, "Haha none of these idiots have even used system," because you're busy drowning out the people trying to get real issues with systemd addressed (like lack of any kind of privilege separation, and parsing unsanitised local socked input in pid 0 running as root, and not working properly if you need to run services as directory users, and a whole bunch of other shit).