I have installed
PHP_Codesniffer extension to find out the Magento 2 coding standard issues.
I have run the below 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.