One issue with using realistic mockups is that reviewers expect the actual product to match. Take the extreme case of Steve Jobs where he would compare Macromed

One issue with using realistic mockups is that reviewers expect the actual product to match. Take the extreme case of Steve Jobs where he would compare Macromedia Director mockups down to the pixel with the actual products and complain if they weren't perfect. https://books.google.com/books?id=390ISyA-CUEC&pg=PA49&lpg=PA49&dq=steve+jobs+apple+mockups+macromedia&source=bl&ots=WX8Dko2Ojm&sig=ACfU3U3sob0iFdXCwpRtOOvi5jEdffw7gw&hl=en&sa=X&ved=2ahUKEwi1--q6t5HqAhVWoHIEHZ4BBK4Q6AEwAHoECAoQAQ#v=onepage&q=steve%20jobs%20apple%20mockups%20macromedia&f=false https://books.google.com/books?id=390ISyA-CUEC&pg=PA49&lpg=P...