我是否必须在Symfony中为用户实现用户界面

I am creating a webpage with symfony. Are there any advantages in implementing the UserInterface from Symfony\Component\Security\Core\User?

It seems to me, that this interface would not fully represent my needs. For example do not need and want a username rather than just an email.

You need to implement it as many components e.g. Security use it.

Your User can be extended or simplified. For username just do

public function getUsername() 
{
    return $this->getEmail();
}