Dan Johnson [off-list ref] writes:
I was assuming Peter would accept the patch, and reply with a "in the
future, please submit the output of format-patch", thus correcting the
submitter's behavior. This warning would serve someone who did not
know that they wanted the output of format-patch, and hopefully teach
them to send such a reply message.
"Next time, please do this" rarely has worked in practice. This is
because the moment you accepted the current patch, you have already
lost the "carrot" ;-)