Probably because the current solution is much simpler, and works better in the majority of cases. I wouldn't want to worry before going for a long drive, whethe

Probably because the current solution is much simpler, and works better in the majority of cases. I wouldn't want to worry before going for a long drive, whether all my maps data has been updated or not. Since my car is connected to wifi all night long, I'd expect it to download as much data as it might need, so if I suddenly decide to take a road trip, I'm prepared.