[chuckadams]

> You can't just type `ls /etc/init.d` to get a rough overview of what services exist

You never really got that on svinit systems either, since there was still inetd, and cron had at least three different places you had to look as well. With systemd, you have systemctl list-units and you're looking at everything -- to say nothing of being able to filter by status. rc files make you implement service control yourself from scratch every time (save for a small set of primitive utility functions), and every one is a snowflake.