It is as simple as reducing an attack surface. If attackers can't talk to sshd, then can't try to hack it. In a world where zero days are real, why chance it?

It is as simple as reducing an attack surface. If attackers can't talk to sshd, then can't try to hack it. In a world where zero days are real, why chance it? Why is that so hard to grasp. Still boggles my mind.