Seem like they recommending it only for "critical vulnerabilities under active exploitation". For vulnerabilities where exploits increase as each day passes because of non-disclosure, I would want quick notification.
FTA and not quite in the summary:
“Our standing recommendation is that companies should fix critical vulnerabilities within 60 days — or, if a fix is not possible, they should notify the public about the risk and offer workarounds,” the two said in a blog post today. “We encourage researchers to publish their findings if reported issues will take longer to patch. Based on our experience, however, we believe that more urgent action — within seven days — is appropriate for critical vulnerabilities under active exploitation. The reason for this special designation is that each day an actively exploited vulnerability remains undisclosed to the public and unpatched, more computers will be compromised.”