I have gdm set to disabled - but some updates occasionally turn it on again - PITA…
I will try to disable fluidsynth if/when it happens again… I won’t hold my breath…
I’m well used to using systemd to do “stuff” - I can still remember when Red Hat had “chkconfig” to enable, or disable systemd stuff - and most people did Windows style “service stop BLAH”… RHEL were pushing us that way even back in SystemD init “times” 10+ years ago… But even Sun were pushing us that way 15+ years ago with Solaris “SMF”…