There used to be a checkbox on the page for whether or not to display the viewport meta tag. It appears to have been removed and the tag is automatically included now. =( For pages where I was inserting this tag via script manager, my pages now have two meta viewport instructions which is confusing for the browser.
The default does not avoid/resolve the awkward rescaling zoom on mobile devices.
Solution request: Provide option to hide the default tag – OR – allow users to pick/enter the desired content attribute.