I would say one of the biggest drawbacks is that (in US operations, anyway) there is very often a requirement to "check the load"; to get off the forklift and scan the bar-codes and log the weights and numbers, and this requires climbing off the fork truck and walking around the load then climbing back on the fork truck. while the actual driving of the articulated truck maybe/is faster in taking from a truck and putting into racks, the climbing on and off the truck can be pretty tiresome. AND a lot of logistic planners would like to see a "cross dock" capability built into their operation, when nothing goes into racks, but is sorted on the dock and put into outbound trucks as soon as it arrives inbound.