What is the advantage of using safety harness on a 180 cm heights ?

safety harness prevent fall from the hights

A fall arrest system is required if any risk exists that a worker may fall from an elevated position, as a general rule, the fall arrest system should be used anytime a working height of six feet or more is reached. Working height is the distance from the walking/working surface to a grade or lower level. A fall arrest system will only come into service should a fall occur. A full-body harness with a shock-absorbing lanyard or a retractable lifeline is the only product recommended. A full-body harness distributes the forces throughout the body, and the shock-absorbing lanyard decreases the total fall arresting forces.

This is to keep you from breaking anything on your body.

and it is a good practice to keep you to remember to wear safety harness on a 1800 cm heights. Muscles memory.