User blog comment:Kirkburn/Technical Update: March 3, 2015/@comment-876022-20150304130533/@comment-1038387-20150304143134

I wouldn't consider it cheap advertising. More like slightly patronizing.

I think the button is useful. Mobile traffic exists, and can't be denied, no matter your personal opinion on it. But the majority of sites just didn't account for mobile, and it looks bad - to the point that simple tweaks won't make it look better, and all-out revisioning is needed. And nobody likes that.