[moltonel]

You'll need 100s of areas if you want to minimise your local storage usage, and micro-managing that would be a PITA. GM announces 'up to 1750mb' to download the part of my country I traveled to in the last month, it's a non-starter.

Compare that to the 179mb/113mb that I need with OSMAnd/Maps.me for the whole country without fiddling. Add to that the fact that OSM's data is significantly better than Google Map's for my country (YMMV) and that there's no such thing as "offline mode not available in some regions" with OSM.