My main gripe about systemd is lack of encapsulation: Every "module",
and I use that term very loosely, must know the intimate details of
every other "module."

Here's something I wrote on the subject, back in 1998:

http://troubleshooters.com/tpromag/9801.htm#StateOfTroubleshooting

Scan down to the subsection called "Watch Your Back". I read it for the
first time in several years and thought "Everything remains the same:
Only the faces change."

SteveT

Steve Litt
March 2017 featured book: Troubleshooting: Why Bother?
http://www.troubleshooters.com/twb