Why do I need a Server based access to my devices? Could I access the box Directly?

Centralised access control allows different people to have controlled access to different devices
Centralised access allows access to devices without technicians knowing device credentials
Centralised access allows to suspend all access of a technician to any device and/or all devices
Centralised access allows centralised recording of all maintenance sessions for future checking/play back
Centralised access allows coordinated access between users and technicians
Centralised access allows easy access with just your RSA key and your access passwords.