Well, I have tried systemd now ...

[Bill Nottingham]

Michal Jaegermann (michal at harddata.com) said: 
> Well, Lennart says explicitely that with systemd and /usr mounted
> on its own file system things like audio, or printing or plug'n'play
> will not work and that he does not care as they were broken anyway.
> Maybe in some of his warped universe as I can assure you that up and
> including Fedora 14, and with /usr like the above, all these things
> do work just fine.  

Essentially, you have to ensure that everything called during the
boot cycle up until the point that /usr is mounted, including any
and all programs called from udev rules, have all the libraries,
configuration, and data they need to write to, available on the
root partition. (*)

It's something that certainly can be made to work where problems are
found, with enough effort - that would be auditing that would have
to be done on each release (potentially each update!). So, then
it's a cost-benefit ratio, and weigh that at against the usage case
of separate /usr (which is.... ?)

Bill