I don't see how the constraints of one system, whether they are right or wrong, really affects the ability of a UX designer to recognize and work within those constraints.
It doesn't mean she is not aware of the issue, she might have prioritized other things and make it "good enough" for other resolutions (even the ipad has a 1024px browser). Apple must know this issue and it's site also ads a scrollbar when the window is less than 1024px...