I think the reasonable argument is not old thing is better ( like some people make, but it has its own problems that are usually because of it trying to do everything.

My main issues stem from it's prevalence in server Distro's especially for micro service images.

D-bus is one of the great offenders for me and I don't like having it on even my desktop system but systemd wants it for many things and some things will just break without it. On a small micro service image, it would be nice to be able to strip lots of it down but systemd fights you on this because of the amount of moving parts and interconnected subs-sytems it introduces.