No Android Auto - Requires invasive system level privileges.

Maps - Google Maps worked/works with or without play services both web and app versions. Just requires GPS lock. GOS can't control third party app quality but Organic Apps, Osmand+ have and do make regular improvements.

Apps defaulting to a different country?

Did you use Aurora? If so that'll be due to where/what locale their throwaway 'anonymous' Google Accounts are registered.

Should you decide to flash again, let me help you resolve any OS specific problems. Be well and take care.