I haven't really see anyone state clearly what has always been my understanding of this issue.
The IETF meeting starts Monday morning and ends Friday lunchtime. We hold all the WG and BOF sessions in one place because synergy and cross-fertilization between WGs is necessary to achieve a reasonably consistent Internet. The intention is that everybody stays for 4.5 days and takes an active part in multiple WGs and BOFs. Parachuting in for one WG is simply not effective, since we need to understand and resolve conflicting issues between WGs.
In that context, late agenda changes in order to minimize clashes are common events.
(This is made fairly clear in the Tao of the IETF, which is more or less required reading for newcomers: http://www.ietf.org/tao.html#2 .)
Brian
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