There have been a ton of conferences in the last couple of months... and luckily a lot of the presentations were recorded and have been posted. Here is Lennart Poettering's presentation from the systemd.conf 2016 conference on, "State of the Union / Portable Services". Enjoy.
Oh look... another presentation by Lennart on systemd... this one from the CoreOS Fest 2015. Enjoy! For those who are iFrame challenged, here's the YouTube link: https://www.youtube.com/watch?v=VIPonFvPlAs