Would 2822bis obsolete 822 fully? If so, I believe it should mention
what happened to the X- header prefix that was part of 822. I don't
believe simply removing them without stating why is a good idea,
people can draw many different conclusions from that, which affect
real implementations.
some people think X- headers are extremely useful, others think they
were a bad mistake that should be eradicated. maybe we need a separate
RFC about X- fields. I'd hate to see this argument block progression
of 2822 bis.