As a sysadmin, for me things like that were very, very minor issues.

The main problem was that systemd had awful documentation, written by people who'd clearly never had to use systemd in anger and just assumed that everything would work swimmingly (and please don't say read the man pages.. those are barely adequate).

When things broke there were no simple and obvious ways to fix it, you had to dive in to its labyrinthine spaghetti architecture and hope and prayed you somehow got the Rube Goldberg machine to work.

Hopefully that's improved by now, and there's some canonical documentation that really shows you how it all fits together and how to fix it when it falls apart.