Not an expert in either so I may be mistaken, but to the best of my knowledge launchd doesn’t have anywhere near the scope of responsibilities or functionality

Not an expert in either so I may be mistaken, but to the best of my knowledge launchd doesn’t have anywhere near the scope of responsibilities or functionality that systemd is capable of/given. It definitely encompasses more than a bare bones init system, but it’s not quite the beast that systemd is.