There are people with car navigation that refuse to make use of it and rely on paper street maps.
There are people that enjoy car navigation but have street maps in their glove box in case they might need them.
The average age of group #1 is probably higher than that of group #2.
Indeed, you are legally obliged to carry up to date maps, however that doesn't have to be on paper. Still, paper remains the most reliable way of compliance. I rarely use paper maps enroute but I still carry them.
What I would NEVER do is rely on an iPad as my sole source of map data. I've had the damn thing fail too often enroute, more the fault of buggy apps than the hardware. I've had the expensive certified Garmin GNS430W fail on me as well.