Is a system running Linux + Wine no different than Windows, just because it implements the same Win32 API? Is FreeBSD the same as Linux, since they both implement POSIX?
Wine is not reliable enough for mission-critical software. Nor is running a nominally POSIX-compliant program that hasn't been tested on FreeBSD. If a project claims not to hard-depend on systemd, I would not trust that unless it's actually, y'know, tested on something that isn't systemd.
There are many ways to implement the same APIs.