Why isn't it possible to access the root account directly in Fedora?
In CentOS and Ubuntu we can access it, but why not in Fedora? What is the security reason for this?
You can access the root account directly in Ubuntu? That's news to me. Ubuntu explicitly restricts access to the root account for security purposes:
In Fedora however, you set a dedicated root password during installation. To become root, the following command should be enough: