I don’t consider this to be a security risk. Linux has root username for this purpose. If you are worried about brute-forcing the password, go for a strong password with at least 8 characters.
There are 6.63 quadrillion possible 8 character passwords that could be generated using the 94 numbers, letters, and symbols on standard keyboard. Every extra character you add to your password will make it exponentially harder to brute-force it.