I don't have the source but I read that in the process of designing a car there are different teams that design outer look, inner look, the actual functionality and at the time of designing interiors it isn't known where or how many buttons you need.

By having a huge touch-screen instead of knobs there is much less need to synchronize between the teams because the inheritor design team just needs to place the screen somewhere. And it's easy to imagine that it can significantly shorten the time to delivery and the costs.