I have installed the PHP_Codesniffer
extension to find out my Magento 2 coding standard issues using this command:
phpcs --standard=Ecg --extensions=php,xml,phtml --report-full=/path/testing.log /path/
This extension lists out many errors in the log file from default Magento 2 itself.
So kindly let me know how to say that the default Magento 2 coding standard has so many issues.