With the amount of people on mobile devices these days, and that number is growing daily, it really should be no surprise that Google (and likely others will follow) is going to make cross-device compatibility a bit higher in priority than previous.
Frankly, I'm surprised it took this long.
It's likely also, at least in part, that the proliferation of sales of mobile redirects are one of the (smaller) signals used in creation of this new directive.
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