In the linked article here, I was quite astonished at how drawing concepts became a reality quite a number of years later. Esslinger gives us an insight into the design and development stages of the Apple products as they are created unlike any other devices out there.
The key to creating a great work of art, literature or media is the ability to see in advance how things will pan out. The greatest designers, whether they work with paint, words, or footage, can see where their characters are going, the changes they needed to make in order to get there, how those changes impact on consumers of their art, and what the endgame is.
I found this article intriguing and recommend a good look into the design philosophies of one (if not the) most profitable and recognised companies in the world.