> I was cherry-picking Maps, but I remember that not all iOS apps were updated to the iOS7 look and feel when it came out
This is not true for apps that come with the OS. Some Apple apps were updated later, but only those that come from the App Store like any other regular 3rd party app.
The advantage Google has to be able to update core apps from the store instead of through OS updates is specific to Android's nature, because it allows them to work around OS updates not being available to customers (because of carriers, OEMs, whatever). Apple doesn't have that problem because they update the OS themselves. Also, Google likes to update its software more often than Apple does.
This is not true for apps that come with the OS. Some Apple apps were updated later, but only those that come from the App Store like any other regular 3rd party app.
The advantage Google has to be able to update core apps from the store instead of through OS updates is specific to Android's nature, because it allows them to work around OS updates not being available to customers (because of carriers, OEMs, whatever). Apple doesn't have that problem because they update the OS themselves. Also, Google likes to update its software more often than Apple does.