If you meant Google a/c attached to an Android device then I would like to differ. I created an account in Korea and used it extensively in India and it also worked well in USA. And yes, on all the three places more than one device was used with the account, over the time.

There's my friend who bought his iPad in Holland and he is in India now but the language of his iPad app store is still Dutch. He says he can change it but that comes with some trouble he is not willing to go through.

There are country specific apps on almost all the app ecosystems.