SmartScreen Filter in Internet Zone - Use it or not?

The SCM 3.0 recommends that SmartScreen filter be enabled for:

• Locked-Down Trusted Sites Zone
• Locked-Down Intranet Zone
• Locked-Down Internet Zone
• Locked-Down Restricted Sites Zone
• Locked-Down Local Machine Zone
• Local Machine Zone

I do not find a recommendation to enable SmartScreen filter for the Internet zone. Is this an oversight or is there something I am missing?

Charlie Newman