The Debian technical committee vote concludes

Well, the thing is that many of the things that systemd does aren't really at all exciting. Take things like systemd-tmpfiles, systemd-timedated, systemd-localed and so on. They're simple and they get the job done, so why shouldn't systemd ship them? The point is that the problems caused by diversity (e. g. application authors having to support different ways of doing the same thing) are greater than the benefits that can conceivably be achieved by replacing those parts.