I understand your point, but would your mom have as easy a time when she visits a site on her android for the first time, but she has visited before (several times) on her desktop?
Google at least recognizes this by including a “classic view” link on the bottom of their mobile site. Something I see very little of. I am curious as to if Google has done any research on this little button and what (if any) the numbers are. We may all guess as to what users are like, but -with all respect- neither your mom nor mine can be said to be a baseline for UX.
My main point is that we now all rush into this “hype” without any background information as to how users handle it. And as usual the insight will be hindsight.