I don't follow fighter jets but that sounds like a good example. You make it sound like the F-16 (Harmattan) was the result of a long evolution but the F-35 (Sailfish) was made completely from scratch, as if no one has ever made a fighter jet (mobile phone OS) before. Clearly this is not the case. Moreover, I do not know about the difference between F-16 and F-35 but the difference between Harmattan and Sailfish is not that great so this is where your example loses a bit of an edge.