So you're saying to just use SysV init to launch processes from inittab, and have one of those processes be a systemd/launchd clone that launches everything else. I mean, I guess that's a possible design, but at that point I would question whether using the SysV init program is really buying you anything.
In any case, most people wouldn't consider that design "SysV init". The SysV init ecosystem is built around rc files.
In any case, most people wouldn't consider that design "SysV init". The SysV init ecosystem is built around rc files.