In my locale, possibly for legal/insurance reasons, Uber drivers far too often keep their phones very low, and out of sight from other vehicles. Therefore, they have to keep looking far down.

For Uber drivers, the app is like a slot machine: you have to keep checking/interacting with it, lest you miss your next fare. With a navapp in a personal car, if it says I need to take no action for the next 1/10/100km, I know I can focus on the vehicles around me instead of signs for roughly that time.