A Redditor writes :)
@dosida: "Hey Lennart. Out of curiosity (and I mean no disrespect with this) but since you want to improve the functionality and efficiency of mount why not work with whoever's maintaining the mount/umount utility and patch that instead of rewriting it and bundling it with systemd?"
"Why is mount's place in systemd instead of its own individual package? Why should systemd, which is (unless I'm mistaken) an init system and its role stops right after the kernel loads... deal with mounts? Why not rewrite or push patches to udevs which is more appropriate to deal with pluggable devices?"