rrule not allowed in vfreebusy?

"Mark D. Anderson" <[email protected]> Sun, 03 Oct 2004 15:14:21 -0700
Newsgroups gmane.ietf.calendar
Message-ID <[email protected]>
Why does 4.6.4 of RFC 2445 specify that recurrence properties
are not to be used in vfreebusy?
Seems like a natural use case to me.....

-mda