This is incorrect though. It might be good for many/most USERS but the US is a small portion of the planet...
Not in terms of actual iOS device owners. The US is 50% of that group, and by far the single largest user market. No other country comes close. In the US, there are 19million iOS device users. In all other countries combined - 20million. The UK is #2 with a distant 3.5million users. It's not unreasonable for Apple - a US country - to prioritize the quality and accuracy of Maps in their home country, which is also their single largest user base by a factor of 6-7x.