[ Sigh. Ignore my previous email correcting my non-error. I've been at my
computer too long today and my eyes are going batty. ]
the second does not follow from the first. or more
specifically, just because someone puts untagged 8bit
characters in a message header does not mean that that person
would support a standard of using utf-8 (or any other
representation other than the one he happened to be using) in
the message header.
However, client support for (and active use of) UTF-8 is far more pervasive
than any of the other proposed encoding schemes.
--Dave