Very advanced, very tuned-in people learn about, and learn how to use, new Apple features by watching them being demonstrated onstage during Apple keynote events.
Then there’s everybody else.
I used to blame having a communication designer manage the human interface group, or the perception that usability/behaviour side of the user experience was deemphasized for the emotive, but for whatever the reason, I agree with the gist of Joe Clark’s article.
One part he didn’t mention specifically is how when pinching to zoom in maps the text stays at the same unreadable size. I once in frustration grabbed a magnifying glass so I could clearly see the garbled text.