One can always limit the scope of the work to only considering specific
changes with the basic assumption that RFC 2822 will remain almost
well, maybe the thing to do is to _discuss_ amendments rather than
a revised document, with the understanding that the amendments won't
be incorporated into the document until (just before) last call.
note that the amendments can still be useful in their own right, for
people who are very familiar with the current spec - those people want
to know the diffs from the previous version.