clone the systemd repo and start helping!
systemd is an exercise in high coupling and low cohesion. Most of the valid complaints about it are sniffing around this issue, even if they're otherwise poorly articulated or salty.
The devs have shown they don't give half a damn about criticism towards that point.
Why would I bother sending them patches to change a design I know they're committed to?
¯\_(ツ)_/¯