There is no need to create mount units, all those thing will work from /etc/fstab, which overrides the generator. And I don't think the intent is to deprecated

There is no need to create mount units, all those thing will work from /etc/fstab, which overrides the generator. And I don't think the intent is to deprecated /etc/fstab. The list of possible automounts is limited: http://www.freedesktop.org/software/systemd/man/systemd-gpt-auto-generator.html http://www.freedesktop.org/software/systemd/man/systemd-gpt-... the point really being that of having a system that can boot without /etc. I've read quite a few complaints about Ubuntu 15.04+btrfs problems, for what is worth I had no problems with Fedora22 and Opensuse Tumbleweed.