Outsourcing email to Google means SPF allows phishing?

I expect this is obvious to many people but bahumbug To Phish, or Not to Phish? just woke me up to the fact that if Google hosts your company email then its Sender Policy Framework might make other Google-sent emails look legitimate for your domain. When combined with the unsupportive support of the big free webmail hosts, is this another black mark against SPF?

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