we need email to work a lot more often than 50% of the time.
really, one failure in ten thousand legitimate messages is
too high...we should be able to achieve one failure in a
hundred thousand messages or better.
Is that the principle why the IESG approved a mail experiment
where each and every mail with MAIL FROM != 2822-From without
2822-Sender fails, if the MAIL FROM has a v=spf1 FAIL-policy ?
you'll have to ask IESG. I'm not responsible for their decisions, and I
certainly don't agree with all of them.