I think it is a combination of both really. If you drive around europe, especially southern europe, it is a white knuckle driving situation a lot of the time. Narrow roads, windy with no embankment, unprotected cliffsides with a pile of hatchbacks on the bottom. Pulling out a smartphone is a death sentence. In the us everything is wide, straight, and embanked, leading to a false sense of confidence where you might open up that smartphone for a minute thinking it is fine. Then we get those dashcam recordings on reddit of people slowly driving off the road and realizing it about 5 seconds too late when all four wheels are already off the pavement and the car is about to flip end over end.