I disagree with that. The primary command line executable provided by systemd is systemctl, this is an apt name to interface with and control the system daemon,

I disagree with that. The primary command line executable provided by systemd is systemctl, this is an apt name to interface with and control the system daemon, which is an executable it also provides, but not one that is intended to be directly invoked from the command daemon. ImageMagick is also far more than the command line utility that it provides to interface with it's library. Say that it had been written by a third party, but did the same thing using the ImageMagick library as a dependency, would it then be fine for it to have a different name?