As AnonymousPlanet said, scope of systemd and number of bad decisions (or good decisions with horrible implementation) is way too big to discuss here. Linux is no longer secure or reliable system it used to be. Engineering results and outcomes are bad from just about any angle you can take.

If you belong to the silent but great majority (lol) of users that enjoy and cherish systemd -- just carry on by all means.

If anything there is A LOT of aggression any time somebody says anything 'unwelcome' about systemd.