So would I but there's way too many SPF-only DMARC users and it would be a 
breaking change.

So we have SPF-only DMARC users, and DKIM-only DMARC users, and they could 
easily come to opposite conclusions about the same message. Maybe it’s not 
interoperability in the same sense as disjoint cipher suites, but this seems 
like an interoperability problem to me.

Um, this would be a good time to reread RFC 7489,

I don’t see why something in a previous informational specification would have 
any bearing on the interoperability characteristics here. If there’s something 
there that needs to be said in dmarcbis, it should be in dmarcbis.

There is no interop issue, and nothing about this aspect of DMARC has changed 
since RFC 7489.

If you don't agree please identify the part of the draft that causes the putported interop problem.

R's,
John

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