When I looked through the stuff on my systray
and thought, "what do I really not want there/wouldn't mind if it were one
level of indirection away" and it was all system related.
I
don't think this is true for most users though; I for the most part
couldn't care less what my system has to say unless it's critical, and
in that case the indicator applet is not the place for it, something
more attention grabbing is more appropriate.