Why ? Why not add, "boot on different server platforms", then ?
The whole problem with systemd is that it seems to follow this "grand unifying vision" (and somehow I get the feeling this vision is all about finally getting there with "linux on the desktop"; as if it were a technical problem in the first place), and everything that is not part of that vision is discarded as unimportant or "toy".
I'm glad Debian at least makes an effort to provide some choice in this nonsense instead of just cheerleading what seems to be popular at the moment. Not every computer is used for personal computing; not every kernel is a linux, not every Unix is a GNU.
GNU/Linux got to be one of the most successful and important server operating system in history, all with "inadequate" old sysvinit. Somehow, it doesn't strike me as if having a swanky shiny init system is going to pave the way to sudden success because it turns out *that*'s what has been holding GNU/Linux on the desktop back all these years.
Yes, sysvinit can be improved upon/replaced. No, it's simply not important enough to replace it with a poorly architected replacement, fast and shiny though it may be.