Bad Trade Off On Bad Terrain
I've hiked with nearly 90lbs in an oversized expedition pack in winter conditions through cedar bogs (ancient north pacific rain forest) and continued up mountains, hiking up rock creek beds cutting through the moss and soil forest floor and the snow and ice at higher altitudes. There's no way I'd ever trade off agility for load transfer. Agility has saved my life especially when agility is combined with limberness. There's no way a rig like that would allow the speed of correction required to save a hiker from a steep fall. That stuff looks like it'd be effective and safe over the same level terrain a wheeled suitcase would be. Lastly serious hikers hit endorphin highs where the heavy going becomes a light headed dance and, again, a rig like that isn't going to allow the fluidity of movement.