Japanese exoskeleton without motors or hydraulics

Unless it is to be clad with a covering then used as a movie prop, I fail to see any useful purpose. The main reason for wearing an exoskeleton is #1 to give the wearer the return of lost mobility, #2 increase stamina by reducing fatigue in the workplace # 3 increase strength for lifting and carrying heavier objects, #4 increase speed and prolong endurance while affording armor against enemy small arms fire. I don't see this thing offering any of these.
I think Sir Robert Heinlein described the perfect exoskeleton
"Our suits give us better eyes, better ears, stronger backs (to carry heavier weapons and more ammo), better legs, more intelligence (in the military meaning...), more firepower, greater endurance, less vulnerability. A suit isn't a space suit - although it can serve as one. it is not primarily armor - although the Knights of the Round Table were not armored as well as we are. It isn't a tank - but a single M.I. [Mobile Infantry] private could take on a squadron of those things and knock them off unassisted...

...Suited up, you look like a big steel gorilla, armed with gorilla-sized weapons.

The real genius in the design is that you don't have to control the suit; you just wear it, like your clothes, like skin.

Japanese exoskeleton without motors or hydraulics - GIF