Car interiors are a wildly different use case. The safety concerns of operating a flat surface while driving and having to keep one's eyes on the road probably

Car interiors are a wildly different use case. The safety concerns of operating a flat surface while driving and having to keep one's eyes on the road probably outweigh the benefits of a flexible UI design. In practice, however, the best approach seems to be a hybrid one: Keep basic, important functions physical, tactile, easily and blindly accessable while serving the details on a blank canvas. For phones and tablets I prefer the giant screen approach.