Another daemon for managing control groups

<quote> It is interesting to note that the backlash against these new file systems is a lot less emotional than the one against systemd, even though the underlying idea of coming up with a radical new integrated design to replace a number of loosely-connected existing but sub-optimal infrastructure elements is quite similar. (But then again, Btrfs wasn't invented by Lennart Poettering.) </quote>

AFAIK, no distros have plans to adopt a single filesystem as the One True filesystem and stop supporting all others. The same cannot be said for systemd.

The upshot of this is that while you're always free to run whatever FS you choose despite the default choice of your distro's installer, the same cannot be said for the ease with which one can switch init systems.