The other problem is the flat design which makes it non-obvious which parts of the UI are tappable controls and which are just read-only design elements or indicators or labels.
Another issue is inconsistent placement. For example during iPhone setup, sometimes you have Continue buttons centered in the bottom half of the screen, and sometimes you have to tap the small “Next” label at the top right of the screen. I’ve had family members get stuck in that process because the Next button was so inconspicuous and so far removed from the main elements of the current dialog that it was completely unclear to them how to move forward.
Another issue is inconsistent placement. For example during iPhone setup, sometimes you have Continue buttons centered in the bottom half of the screen, and sometimes you have to tap the small “Next” label at the top right of the screen. I’ve had family members get stuck in that process because the Next button was so inconspicuous and so far removed from the main elements of the current dialog that it was completely unclear to them how to move forward.