systemd-analyze dot is nice in theory. In practice the sheer amount of dependencies makes the results difficult to use or understand.

That it's a mixture of before and requires (probably also wants, don't rememeber) does not make it easier.

Edit: Newer version have options to separate ordering from requirements. I don't think that existed on the system where I last used it.

yes and it also fails to catch that. and when reported years ago it was dismissed as "debian is doing weird shit. nobody sane depends things like so"