Did not do anything seriously nasty that i was immediately aware of and the systemd fault mentioned here (my blog) means systemd cannot load postfix on start up at all systend is very shit software.
zeitgeist-daemon is another headache with systemd as i baked a disk and could not start the x server on the machine on next login. So i killed all my users processes [not root] and gave up and found some hardware elsewhere that worked. I shall look into removing zeitgeist-daemon
I think i also lost x access for root in 9.2 as well not that i use it often [once a year] but having a gui as root is nicer than vi when you have four servers to do stuff to..
I could see a migration to the bsd way if things continue to go a certain way.- I demand very little but when systemd wont start stuff,magic daemons stop x and none of it your fault then perhaps linux as a server is not the thing i thought it was.
On that thought lets leave as accommodating linux quirks is possible but not that desirable perhaps you can justify calling /usr/sbin/postfix instead of using systemd in scripts but i feel perhaps there is something that works rather than is supposed too but does not.
I look forward to exploring bsd and knowing more so i can make an informed choice.