I bought a palm pre when I was in infantry school and learned a week later I'd be assigned to a unit in Okinawa Japan where the phone wouldn't work. Cool device though.
Oil is useful. I get it. How much oil is burned in comparison to oil used in manufacturing? When we typically talk about eliminating oil we are talking about not burning it anymore.
You'll often see screens surrounded on all sides by physical buttons. The screen can be updated and changed over time but the interaction is still physical.
I'd argue that humans have evolved to physically manipulate their environment. Safety critical systems are the last place you want UI variation. Things need to be predictable and tactile to build muscle memory.