My first disappointment is that the new features are still limited. The biggest size for an offline area you can download is 120,000 square kilometers and there are many countries that are bigger than that. I downloaded London's map and checked the size of the map: 332 MB. It also expires in 29 days (maps need to be updated at least every 30 days).
It looks like Google's maps include too much information, they take up too much space and there's no way to download some simplified maps.
Let's try one of the smallest countries in Europe: Liechtenstein, which has an area of only 160 square kilometers. The offline map has 62 MB. New York? 409 MB. Los Angeles? 356 MB. Tokyo, Seoul, Beijing, Bangkok? Not available because of licensing issues.
Forget about downloading the map for an entire country. Google Maps still can't replace the Here app or paid navigation apps.