People use systemd because it solves real problems that are not adequately solved by init scripts. Your "want for nothing" says more about your limited needs (which is fine) than anything else about system management services.

Regardless of one's opinions or critiques about the implementation of systemd specifically, the idea that it came up in some kind of vacuum or started a "trend" is utterly ridiculous.

Prior art in UNIX would be SMF at a minimum, and systemd clearly looked at launchd for some inspiration in other areas (systemd ended up having the goal of covering both use cases of launchd and SMF.. ie generally server and desktop).

Also what is this about binary blobs? systemd is configured with text files. Last I checked, the init process itself on BSD is a binary.