The distros are using systemd because it makes writing startup scripts easier. They take up fewer lines. That's about it. It has nothing to do with DevOps.
I am pretty sure those distros who started this spend more money paying systemd developers than they save from writing easier startup scripts.
"Kill the Wabbit, Kill the Wabbit, Kill the Wabbit!" -- Looney Tunes, "What's Opera Doc?" (1957, Chuck Jones)