The very same people that hate systemd for "being a monolith" and limiting choice are usually also love X and hate Wayland where they can manage to explain how being a monolith is suddenly good.
Especially that systemd is pretty modular - at least the actual systemd program running as PID 1. It also refers to a project with many optional modules running under the same name, but that's like KDE having a file manager and complaining that plasma DE is a monolith.