Sysvinit is not 1000 lines if you add all the scripts you have to write to get feature parity with systemd. And now you have written that in the worst programming language ever created, bash, that is basically impossible to not be chock full of errors.

Frankly the amount of crying I have seen about systemd... and it's basically the most stable part of my Linux installs. Even though I really have seen everything else "catch on fire".