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I think the point is that root is a universal user found on all linux systems where as users have all kinds of names. It narrows down the variables to brute-force, so simply removing the ability to use it means they have to guess a username and a password.
guess a username and a password.
Security by obscurity is no security. Use something like fail2ban to prevent brute force. When you use a secure password and or key this also does not matter much.
Something something don’t let ‘good’ be the enemy of ‘perfect’
