That’s not true at all? I don’t think they use multicall binaries and both systemd-boot and udev (I don’t remember any other util that became part of systemd) are still separate. And every other utility under systemd umbrella is separate as well.
As for philosophy, no unix ever even tried in any way to embody this.
I don’t disagree that term itself exists of course. But it was and is bullshit that those philosophers themselves never actually followed.