>Surely deploying ~all is done in order for you to determine which edge cases 
>won't pass, prior to considering a move to -all?

In a word, no.  

If your name is Paypal, you can probably control the hosts that send
mail with your return address, the mail is of low value since it
rarely says anything more than to log in and check your account, and
you are so heavily phished that the costs of losing a little
legitimate mail are vastly outweighed by the benfits of less phishing.
They publish -all and it makes sense.

If your name is not Paypal, and particularly if your domain is used by
humans to send mail, ~all means what it says, this isn't my host, but
the mail might be OK anyway.  Anyone who thinks that the world's mail
systems will reorganize themselves for the convenience of SPF fans
hasn't been paying attention for the past decade.

R's,
John


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